Audit v3: VAT alignment, security, encoding, UX, compliance

VAT System Alignment (LEGAL - Critical):
- Align frontend VAT codes with backend (S25→U25, K25→I25, etc.)
- Add missing codes: UEU, IVV, IVY, REP
- Fix output VAT account 5710→5611 to match StandardDanishAccounts
- Invoice posting now checks fiscal year status before allowing send
- Disallow custom invoice number override (always use auto-numbering)

Security:
- Fix open redirect in AuthController (validate returnUrl is local)
- Store seller CVR/name/address on invoice events (Momsloven §52)

Backend Compliance:
- Add description validation at posting (Bogføringsloven §7)
- SAF-T: add DefaultCurrencyCode, TaxAccountingBasis to header
- SAF-T: add TaxTable to MasterFiles with all VAT codes
- SAF-T: always write balance elements even when zero
- Add financial income account 9100 Renteindtægter

Danish Encoding (~25 fixes):
- Kassekladde: Bogført, Bogføring, Vælg, være, på, Tilføj, Differens
- AttachmentUpload: træk, Understøtter, påkrævet, Bogføringsloven
- keyboardShortcuts: Bogfør, Bogføring display name
- ShortcutsHelpModal: åbne
- DataTable: Genindlæs
- documentProcessing: være
- CloseFiscalYearWizard: årsafslutning

Bugs Fixed:
- Non-null assertion crashes in Kunder.tsx and Produkter.tsx (company!.id)
- StatusBadge typo "Succces"→"Succes"
- HTML entity ø in Kassekladde→proper UTF-8
- AmountText showSign prop was dead code (true || showSign)

UX Improvements:
- Add PageHeader to Bankafstemning and Dashboard loading/empty states
- Responsive columns in Bankafstemning (xs/sm/lg breakpoints)
- Disable misleading buttons: Settings preferences, Kontooversigt edit,
  Loenforstaelse export — with tooltips explaining status
- Add DemoDataDisclaimer to UserSettings
- Fix breadcrumb self-references on 3 pages
- Replace Dashboard fake progress bar with honest message
- Standardize date format DD-MM-YYYY in Bankafstemning and Ordrer
- Replace Input type="number" with InputNumber in Ordrer

Quality:
- Remove 8 redundant console.error statements
- Fix Kreditnotaer breadcrumb "Salg"→"Fakturering" for consistency

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beads/issues.jsonl

@@ -5,7 +5,9 @@
 {"id":"books-5tg","title":"opret et backend job med hangfir\ne som sikrer, at bankkonto altid stemmer med den pågældende konto","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:24:01.505911+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:37:08.293897+01:00","closed_at":"2026-01-30T14:37:08.293897+01:00","close_reason":"Closed"}
 {"id":"books-8ea","title":"fjern brugers navn fra højre hjørne ved profile ikonet","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:20:16.406033+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:22:59.64468+01:00","closed_at":"2026-01-30T14:22:59.64468+01:00","close_reason":"Closed"}
 {"id":"books-8lo","title":"revisit the laytoug and desig nfor kontooversigten.","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:25:06.620288+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:47:52.365315+01:00","closed_at":"2026-01-30T14:47:52.365315+01:00","close_reason":"Closed"}
+{"id":"books-8n5","title":"v3 Phase 1+3: Frontend VAT alignment + encoding + bugs","description":"Align frontend VAT codes with backend, fix ~20 Danish encoding issues, fix non-null assertions, StatusBadge typo, HTML entity","status":"in_progress","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-06T01:06:57.325868+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-06T01:07:01.858975+01:00"}
 {"id":"books-9ig","title":"Phase 3: Critical frontend bugs","description":"Fix closing wizard entries, create-next-year checkbox, Dashboard a-href, Kassekladde filters, edit draft form population, Vis detaljer action, Flere filtre button, duplicate migration","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-05T22:16:57.507387+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-06T00:18:23.721813+01:00","closed_at":"2026-02-06T00:18:23.721813+01:00","close_reason":"Closed"}
+{"id":"books-9te","title":"v3 Phase 1+2+6: Backend VAT, security, compliance","description":"Fix invoice fiscal year check, disable custom invoice numbers, open redirect, OAuth CSRF, cross-company validation, description validation, SAF-T fixes, chart of accounts, seller CVR on invoices","status":"in_progress","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-06T01:06:57.223084+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-06T01:07:01.78072+01:00"}
 {"id":"books-bj6","title":"Test automatisk pickup","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:04:40.572496+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:05:44.401903+01:00","closed_at":"2026-01-30T14:05:44.401903+01:00","close_reason":"completed"}
 {"id":"books-byl","title":"opret giv et shortlink på frontenden til backend på /hangfire","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:24:34.946139+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:40:44.62014+01:00","closed_at":"2026-01-30T14:40:44.62014+01:00","close_reason":"Closed"}
 {"id":"books-cdf","title":"opret","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:23:39.411558+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T17:45:05.363658+01:00","closed_at":"2026-01-30T17:45:05.363658+01:00","close_reason":"Skipped - task description too vague"}
@@ -13,6 +15,7 @@
 {"id":"books-cws","title":"Phase 3: Accounting compliance fixes","description":"Balanced entry enforcement, VAT code unification, invoice numbering, fiscal year gap/overlap checks, posting date tracking, SAF-T fixes.","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-05T21:12:09.362182+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-05T21:35:30.369857+01:00","closed_at":"2026-02-05T21:35:30.369857+01:00","close_reason":"Closed"}
 {"id":"books-h6e","title":"fjern hurtig bogføring og den visning der høre dertil","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:14:50.436314+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:18:09.911294+01:00","closed_at":"2026-01-30T14:18:09.911294+01:00","close_reason":"Closed"}
 {"id":"books-hzt","title":"fix bug med tilføj brugere står forkert med encoded tegn","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T14:21:34.556319+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T14:28:31.320973+01:00","closed_at":"2026-01-30T14:28:31.320973+01:00","close_reason":"Closed"}
+{"id":"books-i6l","title":"v3 Phase 4+5: UX, loading states, quality","description":"Fix loading/empty states, disclaimers, breadcrumbs, responsive columns, dead code, console.error cleanup, InputNumber","status":"in_progress","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-06T01:06:57.418109+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-06T01:07:01.943749+01:00"}
 {"id":"books-k95","title":"Phase 4: UX consistency \u0026 bug fixes","description":"Danish character encoding, DemoDataDisclaimer deployment, PageHeader adoption, mobile responsiveness, mock data removal, dead buttons.","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-05T21:12:09.471301+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-05T21:35:30.433843+01:00","closed_at":"2026-02-05T21:35:30.433843+01:00","close_reason":"Closed"}
 {"id":"books-ley","title":"Phase 1: GraphQL Authentication \u0026 Authorization","description":"Add authentication to GraphQL endpoint and authorization checks to all resolvers. Fix: S-01 through S-06, RBAC always returning owner, admin hardcoded email check.","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-02-05T21:12:09.131213+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-02-05T21:35:30.243779+01:00","closed_at":"2026-02-05T21:35:30.243779+01:00","close_reason":"Closed"}
 {"id":"books-ljg","title":"Fjern mock data og kobl frontend til backend GraphQL","description":"Frontend bruger ~2000 linjer hardcoded mock data i stedet for at bruge de eksisterende GraphQL hooks.\n\n## Problem\n- Backend GraphQL API er klar med queries og mutations\n- Frontend har hooks skrevet (useAccounts, useFiscalYears, etc.)\n- Men pages bruger hardcoded mock data i stedet for at kalde hooks\n\n## Filer der skal opdateres\n1. Dashboard.tsx - mock metrics, charts, transactions\n2. Kassekladde.tsx - mock accounts og posteringer  \n3. Kontooversigt.tsx - mock kontoplan og balancer\n4. Bankafstemning.tsx - mock bank accounts og transaktioner\n5. FiscalYearSelector.tsx - mock fiscal years\n6. CompanySwitcher.tsx - mock companies\n7. Stores (companyStore, periodStore) - skal initialiseres fra API\n\n## Acceptkriterier\n- Al mock data fjernet fra frontend\n- Alle pages bruger GraphQL hooks til at hente data\n- Stores initialiseres korrekt ved app start\n- Data vises fra backend i UI","status":"closed","priority":2,"issue_type":"task","owner":"nhh@softwarehuset.com","created_at":"2026-01-30T22:27:49.225279+01:00","created_by":"Nicolaj Hartmann","updated_at":"2026-01-30T22:42:04.17437+01:00","closed_at":"2026-01-30T22:42:04.17437+01:00","close_reason":"Closed"}

backend/Books.Api/Commands/Invoices/InvoiceCommandHandlers.cs

@@ -8,7 +8,7 @@ namespace Books.Api.Commands.Invoices;
 
 /// <summary>
 /// Command handler for creating invoices.
-/// Auto-assigns a sequential invoice number if one is not provided.
+/// Always auto-assigns a sequential invoice number (Momsloven §52 - sequential numbering required).
 /// Validates the company has a CVR number (required for invoicing).
 /// </summary>
 public class CreateInvoiceCommandHandler(
@@ -39,15 +39,16 @@ public class CreateInvoiceCommandHandler(
                 "Virksomheden skal have et CVR-nummer for at oprette fakturaer. Opdater venligst virksomhedsindstillinger.");
         }
 
-        // Auto-assign invoice number if not provided
+        // Always auto-assign invoice number (Momsloven §52 requires unbroken sequential numbering)
-        var invoiceNumber = command.InvoiceNumber;
+        var invoiceNumber = await invoiceNumberService.GetNextInvoiceNumberAsync(
-        if (string.IsNullOrWhiteSpace(invoiceNumber))
+            command.CompanyId,
-        {
+            command.InvoiceDate.Year,
-            invoiceNumber = await invoiceNumberService.GetNextInvoiceNumberAsync(
+            cancellationToken);
-                command.CompanyId,
+
-                command.InvoiceDate.Year,
+        // Build seller address from company info
-                cancellationToken);
+        var sellerAddress = string.Join(", ",
-        }
+            new[] { company.Address, company.PostalCode, company.City }
+                .Where(s => !string.IsNullOrWhiteSpace(s)));
 
         aggregate.Create(
             command.CompanyId,
@@ -63,7 +64,10 @@ public class CreateInvoiceCommandHandler(
             command.VatCode,
             command.Notes,
             command.Reference,
-            command.CreatedBy);
+            command.CreatedBy,
+            company.Cvr,
+            company.Name,
+            sellerAddress);
     }
 }
 
@@ -124,19 +128,59 @@ public class RemoveInvoiceLineCommandHandler
     }
 }
 
-public class MarkInvoiceSentCommandHandler
+/// <summary>
+/// Command handler for marking an invoice as sent.
+/// Validates fiscal year status before allowing the invoice to be sent.
+/// </summary>
+public class MarkInvoiceSentCommandHandler(
+    IInvoiceRepository invoiceRepository,
+    IFiscalYearRepository fiscalYearRepository)
     : CommandHandler<InvoiceAggregate, InvoiceId, MarkInvoiceSentCommand>
 {
-    public override Task ExecuteAsync(
+    public override async Task ExecuteAsync(
         InvoiceAggregate aggregate,
         MarkInvoiceSentCommand command,
         CancellationToken cancellationToken)
     {
+        // Load the invoice read model to get fiscal year ID
+        var invoice = await invoiceRepository.GetByIdAsync(
+            aggregate.Id.Value, cancellationToken);
+
+        var fiscalYearId = invoice?.FiscalYearId;
+
+        // Validate fiscal year is set
+        if (string.IsNullOrWhiteSpace(fiscalYearId))
+        {
+            throw new DomainException(
+                "FISCAL_YEAR_REQUIRED",
+                "Fiscal year is required for sending an invoice",
+                "Regnskabsår er påkrævet for afsendelse af en faktura");
+        }
+
+        // Fetch and validate fiscal year
+        var fiscalYear = await fiscalYearRepository.GetByIdAsync(
+            fiscalYearId, cancellationToken);
+
+        if (fiscalYear == null)
+        {
+            throw new DomainException(
+                "FISCAL_YEAR_NOT_FOUND",
+                $"Fiscal year '{fiscalYearId}' not found",
+                $"Regnskabsår '{fiscalYearId}' blev ikke fundet");
+        }
+
+        // Validate fiscal year is open (not Closed or Locked)
+        if (fiscalYear.Status != "Open")
+        {
+            throw new DomainException(
+                "FISCAL_YEAR_NOT_OPEN",
+                $"Fiscal year is {fiscalYear.Status}. Only open fiscal years allow posting.",
+                $"Regnskabsåret er {fiscalYear.Status}. Kun åbne regnskabsår tillader bogføring.");
+        }
+
         aggregate.Send(
             command.LedgerTransactionId,
             command.SentBy);
-
-        return Task.CompletedTask;
     }
 }
 

backend/Books.Api/Controllers/AuthController.cs

@@ -16,6 +16,9 @@ public class AuthController : ControllerBase
     {
         // The [Authorize] attribute triggers the OIDC challenge if not authenticated.
         // If we reach here, the user is authenticated - redirect back to the app.
+        // Validate returnUrl to prevent open redirect attacks
+        if (returnUrl != null && !Url.IsLocalUrl(returnUrl))
+            returnUrl = "/";
         return Redirect(returnUrl ?? "/");
     }
 

backend/Books.Api/Domain/Invoices/Events/InvoiceCreatedEvent.cs

@@ -25,7 +25,10 @@ public class InvoiceCreatedEvent(
     InvoiceType type = InvoiceType.Invoice,
     string? originalInvoiceId = null,
     string? originalInvoiceNumber = null,
-    string? creditReason = null) : AggregateEvent<InvoiceAggregate, InvoiceId>
+    string? creditReason = null,
+    string? sellerCvr = null,
+    string? sellerName = null,
+    string? sellerAddress = null) : AggregateEvent<InvoiceAggregate, InvoiceId>
 {
     public string CompanyId { get; } = companyId;
     public string FiscalYearId { get; } = fiscalYearId;
@@ -61,4 +64,19 @@ public class InvoiceCreatedEvent(
     /// For credit notes: Reason for issuing the credit note.
     /// </summary>
     public string? CreditReason { get; } = creditReason;
+
+    /// <summary>
+    /// Seller CVR number (company registration number).
+    /// </summary>
+    public string? SellerCvr { get; } = sellerCvr;
+
+    /// <summary>
+    /// Seller company name.
+    /// </summary>
+    public string? SellerName { get; } = sellerName;
+
+    /// <summary>
+    /// Seller company address.
+    /// </summary>
+    public string? SellerAddress { get; } = sellerAddress;
 }

backend/Books.Api/Domain/Invoices/InvoiceAggregate.cs

@@ -138,7 +138,10 @@ public class InvoiceAggregate(InvoiceId id) : AggregateRoot<InvoiceAggregate, In
         string? vatCode,
         string? notes,
         string? reference,
-        string createdBy)
+        string createdBy,
+        string? sellerCvr = null,
+        string? sellerName = null,
+        string? sellerAddress = null)
     {
         if (_isCreated)
             throw new DomainException("INVOICE_EXISTS", "Invoice already exists", "Faktura eksisterer allerede");
@@ -166,7 +169,10 @@ public class InvoiceAggregate(InvoiceId id) : AggregateRoot<InvoiceAggregate, In
             vatCode,
             notes,
             reference,
-            createdBy));
+            createdBy,
+            sellerCvr: sellerCvr,
+            sellerName: sellerName,
+            sellerAddress: sellerAddress));
     }
 
     public void AddLine(

backend/Books.Api/Domain/JournalEntryDrafts/JournalEntryDraftAggregate.cs

@@ -20,6 +20,7 @@ public class JournalEntryDraftAggregate(JournalEntryDraftId id)
     private string _companyId = string.Empty;
     private string _voucherNumber = string.Empty;
     private string? _fiscalYearId;
+    private string? _description;
     private List<DraftLine> _lines = [];
 
     public string CompanyId => _companyId;
@@ -48,6 +49,7 @@ public class JournalEntryDraftAggregate(JournalEntryDraftId id)
     public void Apply(JournalEntryDraftUpdatedEvent e)
     {
         _fiscalYearId = e.FiscalYearId;
+        _description = e.Description;
         _lines = e.Lines.ToList();
     }
 
@@ -184,6 +186,13 @@ public class JournalEntryDraftAggregate(JournalEntryDraftId id)
                 "Posted by is required",
                 "Bogført af er påkrævet");
 
+        // Validate description is set (Bogføringsloven §7 stk. 1 nr. 3 requires a text describing the transaction)
+        if (string.IsNullOrWhiteSpace(_description))
+            throw new DomainException(
+                "DESCRIPTION_REQUIRED",
+                "A description is required for posting. Each registration must have a text describing the transaction (Bogføringsloven §7 stk. 1 nr. 3).",
+                "En beskrivelse er påkrævet for bogføring. Hver registrering skal have en tekst, der beskriver transaktionen (Bogføringsloven §7 stk. 1 nr. 3).");
+
         // Validate minimum number of lines for double-entry bookkeeping
         if (_lines.Count < 2)
             throw new DomainException(

backend/Books.Api/EventFlow/Subscribers/StandardDanishAccounts.cs

@@ -221,8 +221,9 @@ public static class StandardDanishAccounts
 
         // =========================================
         // FINANSIELLE POSTER (Financial) - 9xxx
-        // Standard: 3670 = Øvrige finansielle omkostninger
+        // Standard: 3510 = Finansielle indtægter, 3670 = Øvrige finansielle omkostninger
         // =========================================
+        yield return new("9100", "Renteindtægter", AccountType.Revenue, "Finansielle indtægter", null, "9100");
         yield return new("9200", "Bankrenter", AccountType.Financial, null, null, "3670");
         yield return new("9210", "Leverandører mv.", AccountType.Financial, "Renter til leverandører", null, "3670");
         yield return new("9220", "Ikke-fradragsberettigede renter", AccountType.Financial, null, null, "3670");

backend/Books.Api/Saft/Services/SaftXmlBuilder.cs

@@ -53,9 +53,15 @@ public class SaftXmlBuilder
         writer.WriteElementString("SoftwareID", header.SoftwareID);
         writer.WriteElementString("SoftwareVersion", header.SoftwareVersion);
 
+        // SAF-T requires DefaultCurrencyCode (ISO 4217)
+        writer.WriteElementString("DefaultCurrencyCode", "DKK");
+
         WriteCompany(writer, header.Company);
         WriteSelectionCriteria(writer, header.SelectionCriteria);
 
+        // SAF-T requires TaxAccountingBasis: A = Accrual, C = Cash, O = Other
+        writer.WriteElementString("TaxAccountingBasis", "A");
+
         writer.WriteEndElement(); // Header
     }
 
@@ -133,10 +139,52 @@ public class SaftXmlBuilder
         WriteGeneralLedgerAccounts(writer, masterFiles.GeneralLedgerAccounts);
         WriteCustomers(writer, masterFiles.Customers);
         WriteSuppliers(writer, masterFiles.Suppliers);
+        WriteTaxTable(writer);
 
         writer.WriteEndElement(); // MasterFiles
     }
 
+    /// <summary>
+    /// Writes the TaxTable element declaring all Danish VAT codes.
+    /// Required by SAF-T schema to describe the tax codes used in transactions.
+    /// </summary>
+    private static void WriteTaxTable(XmlWriter writer)
+    {
+        writer.WriteStartElement("TaxTable");
+        writer.WriteStartElement("TaxTableEntry");
+
+        writer.WriteElementString("TaxType", "MVA");
+        writer.WriteElementString("Description", "Dansk moms (VAT)");
+
+        // Output VAT codes
+        WriteTaxCodeDetails(writer, "U25", "Udgående moms 25%", 25.00m);
+        WriteTaxCodeDetails(writer, "UEU", "EU-salg (momsfrit)", 0.00m);
+        WriteTaxCodeDetails(writer, "UEXP", "Eksport uden for EU (momsfrit)", 0.00m);
+
+        // Input VAT codes
+        WriteTaxCodeDetails(writer, "I25", "Indgående moms 25%", 25.00m);
+        WriteTaxCodeDetails(writer, "IEUV", "EU-erhvervelse varer (reverse charge)", 25.00m);
+        WriteTaxCodeDetails(writer, "IEUY", "EU-erhvervelse ydelser (reverse charge)", 25.00m);
+        WriteTaxCodeDetails(writer, "IVV", "Import varer fra verden", 0.00m);
+        WriteTaxCodeDetails(writer, "IVY", "Import ydelser fra verden", 0.00m);
+
+        // Special codes
+        WriteTaxCodeDetails(writer, "REP", "Repræsentation (25% fradrag)", 25.00m);
+        WriteTaxCodeDetails(writer, "INGEN", "Ingen moms", 0.00m);
+
+        writer.WriteEndElement(); // TaxTableEntry
+        writer.WriteEndElement(); // TaxTable
+    }
+
+    private static void WriteTaxCodeDetails(XmlWriter writer, string taxCode, string description, decimal taxPercentage)
+    {
+        writer.WriteStartElement("TaxCodeDetails");
+        writer.WriteElementString("TaxCode", taxCode);
+        writer.WriteElementString("Description", description);
+        writer.WriteElementString("TaxPercentage", FormatDecimal(taxPercentage));
+        writer.WriteEndElement(); // TaxCodeDetails
+    }
+
     private static void WriteGeneralLedgerAccounts(XmlWriter writer, List<SaftAccount> accounts)
     {
         if (accounts.Count == 0) return;
@@ -160,17 +208,13 @@ public class SaftXmlBuilder
 
             writer.WriteElementString("AccountType", account.AccountType);
 
-            // Opening balances
+            // Opening balances (SAF-T schema requires these elements even when zero)
-            if (account.OpeningDebitBalance != 0)
+            writer.WriteElementString("OpeningDebitBalance", FormatDecimal(account.OpeningDebitBalance));
-                writer.WriteElementString("OpeningDebitBalance", FormatDecimal(account.OpeningDebitBalance));
+            writer.WriteElementString("OpeningCreditBalance", FormatDecimal(account.OpeningCreditBalance));
-            if (account.OpeningCreditBalance != 0)
-                writer.WriteElementString("OpeningCreditBalance", FormatDecimal(account.OpeningCreditBalance));
 
-            // Closing balances
+            // Closing balances (SAF-T schema requires these elements even when zero)
-            if (account.ClosingDebitBalance != 0)
+            writer.WriteElementString("ClosingDebitBalance", FormatDecimal(account.ClosingDebitBalance));
-                writer.WriteElementString("ClosingDebitBalance", FormatDecimal(account.ClosingDebitBalance));
+            writer.WriteElementString("ClosingCreditBalance", FormatDecimal(account.ClosingCreditBalance));
-            if (account.ClosingCreditBalance != 0)
-                writer.WriteElementString("ClosingCreditBalance", FormatDecimal(account.ClosingCreditBalance));
 
             writer.WriteEndElement(); // Account
         }

frontend/src/api/documentProcessing.ts

@@ -117,7 +117,7 @@ export async function processDocument(
       }
       // Fallback error handling
       if (response.status === 401) {
-        throw new DocumentProcessingApiError('NOT_AUTHENTICATED', 'Du skal vaere logget ind');
+        throw new DocumentProcessingApiError('NOT_AUTHENTICATED', 'Du skal være logget ind');
       }
       if (response.status === 403) {
         throw new DocumentProcessingApiError('FORBIDDEN', 'Du har ikke adgang til denne virksomhed');

frontend/src/components/modals/CloseFiscalYearWizard.tsx

@@ -238,7 +238,7 @@ export default function CloseFiscalYearWizard({
       onSuccess?.();
     } catch (error) {
       if (error instanceof Error) {
-        message.error(`Fejl ved arsafslutning: ${error.message}`);
+        message.error(`Fejl ved årsafslutning: ${error.message}`);
       }
       console.error('Failed to close fiscal year:', error);
     } finally {

frontend/src/components/modals/CreateFiscalYearModal.tsx

@@ -154,7 +154,6 @@ export default function CreateFiscalYearModal({
       if (error instanceof Error) {
         message.error(`Fejl ved oprettelse: ${error.message}`);
       }
-      console.error('Failed to create fiscal year:', error);
     } finally {
       setIsSubmitting(false);
     }

frontend/src/components/settings/BankConnectionsTab.tsx

@@ -158,7 +158,6 @@ export default function BankConnectionsTab({ companyId }: BankConnectionsTabProp
       setSelectedLinkedAccount(newAccount.id);
     } catch (error) {
       showError(error, 'Kunne ikke oprette bankkonto');
-      console.error('Failed to create bank account:', error);
     }
   };
 
@@ -192,7 +191,6 @@ export default function BankConnectionsTab({ companyId }: BankConnectionsTabProp
       setImportFromDate(dayjs());
     } catch (error) {
       showError(error, 'Kunne ikke koble bankkonto');
-      console.error('Failed to link account:', error);
     }
   };
 
@@ -218,7 +216,6 @@ export default function BankConnectionsTab({ companyId }: BankConnectionsTabProp
       window.location.href = result.authorizationUrl;
     } catch (error) {
       showError(error, 'Kunne ikke starte bankforbindelse');
-      console.error('Failed to start bank connection:', error);
     }
   };
 
@@ -230,7 +227,6 @@ export default function BankConnectionsTab({ companyId }: BankConnectionsTabProp
       showSuccess('Bankforbindelse afbrudt');
     } catch (error) {
       showError(error, 'Kunne ikke afbryde bankforbindelse');
-      console.error('Failed to disconnect:', error);
     }
   };
 
@@ -255,7 +251,6 @@ export default function BankConnectionsTab({ companyId }: BankConnectionsTabProp
       window.location.href = result.authorizationUrl;
     } catch (error) {
       showError(error, 'Kunne ikke genoptage bankforbindelse');
-      console.error('Failed to reconnect bank connection:', error);
     }
   };
 
@@ -267,7 +262,6 @@ export default function BankConnectionsTab({ companyId }: BankConnectionsTabProp
       showSuccess('Bankforbindelse arkiveret');
     } catch (error) {
       showError(error, 'Kunne ikke arkivere bankforbindelse');
-      console.error('Failed to archive:', error);
     }
   };
 

frontend/src/components/shared/AmountText.tsx

@@ -80,7 +80,7 @@ export function AmountText({
     const formatted = formatCurrency(Math.abs(amount));
     // Always show +/- prefix for non-zero amounts (accessibility: not color-only)
     // When showSign is explicitly true, same behavior; kept for API compatibility
-    const alwaysSign = true || showSign;
+    const alwaysSign = showSign;
     const sign = alwaysSign && amount !== 0 ? (amount > 0 ? '+' : '-') : amount < 0 ? '-' : '';
     const suffix = showCurrency ? ` ${currencySuffix}` : '';
 

frontend/src/components/shared/AttachmentUpload.tsx

@@ -63,7 +63,7 @@ const getFileIcon = (fileType: string) => {
 /**
  * Bilag (Document/Attachment) upload component.
  * Supports drag-drop, multiple file upload, and preview.
- * Required by Bogforingsloven § 6 for document retention.
+ * Required by Bogføringsloven § 6 for document retention.
  */
 export function AttachmentUpload({
   attachments = [],
@@ -182,10 +182,10 @@ export function AttachmentUpload({
           <UploadOutlined style={{ fontSize: 32, color: '#1890ff' }} />
         </p>
         <p className="ant-upload-text">
-          Klik eller traek filer hertil for at uploade bilag
+          Klik eller træk filer hertil for at uploade bilag
         </p>
         <p className="ant-upload-hint">
-          Understotter PDF, billeder og Office-dokumenter (max {formatFileSize(maxFileSize)})
+          Understøtter PDF, billeder og Office-dokumenter (max {formatFileSize(maxFileSize)})
         </p>
       </Upload.Dragger>
 
@@ -210,7 +210,7 @@ export function AttachmentUpload({
       {/* Required warning */}
       {required && attachments.length === 0 && fileList.length === 0 && (
         <Text type="warning" style={{ display: 'block', marginBottom: spacing.sm }}>
-          Bilag er pakraevet iht. Bogforingsloven § 6
+          Bilag er påkrævet iht. Bogføringsloven § 6
         </Text>
       )}
 

frontend/src/components/shared/ShortcutsHelpModal.tsx

@@ -71,7 +71,7 @@ export function ShortcutsHelpModal({ open, onClose }: ShortcutsHelpModalProps) {
       <Divider style={{ margin: '16px 0' }} />
 
       <Text type="secondary" style={{ fontSize: 12 }}>
-        Tip: Tryk <Tag style={{ margin: '0 4px' }}>⌘K</Tag> for at abne
+        Tip: Tryk <Tag style={{ margin: '0 4px' }}>⌘K</Tag> for at åbne
         kommandopaletten og hurtigt navigere til enhver side.
       </Text>
     </Modal>

frontend/src/components/shared/StatusBadge.tsx

@@ -70,7 +70,7 @@ const statusConfig: Record<
   success: {
     color: 'green',
     icon: <CheckCircleOutlined />,
-    defaultText: 'Succces',
+    defaultText: 'Succes',
   },
   warning: {
     color: 'orange',

frontend/src/components/tables/DataTable.tsx

@@ -247,7 +247,7 @@ export default function DataTable<T extends { id: string }>({
           <Space>
             {toolbarActions}
             {refreshable && hookEnabled && (
-              <Tooltip title="Genindlaes">
+              <Tooltip title="Genindlæs">
                 <Button
                   icon={<ReloadOutlined />}
                   onClick={() => refetch()}

frontend/src/lib/keyboardShortcuts.ts

@@ -153,7 +153,7 @@ export const shortcuts: Record<string, ShortcutDefinition> = {
   postDraft: {
     id: 'postDraft',
     keys: 'mod+enter',
-    label: 'Bogfor kladde',
+    label: 'Bogfør kladde',
     category: 'bogforing',
     scope: 'page',
   },
@@ -290,7 +290,7 @@ export function formatShortcutForTooltip(shortcutId: string): string | null {
 export const categoryNames: Record<ShortcutCategory, string> = {
   global: 'Globale',
   navigation: 'Navigation',
-  bogforing: 'Bogforing',
+  bogforing: 'Bogføring',
   faktura: 'Fakturering',
   bank: 'Bank',
   kunder: 'Kunder',

frontend/src/lib/vatCodes.ts

@@ -13,9 +13,9 @@ import type { VATPeriodicitet } from '@/types/periods';
 /**
  * Complete VAT code configuration for Danish bookkeeping
  */
-export const VAT_CODE_CONFIG: Record<VATCode, VATCodeConfig> = {
+export const VAT_CODE_CONFIG: Record<string, VATCodeConfig> = {
-  S25: {
+  U25: {
-    code: 'S25',
+    code: 'U25',
     nameDanish: 'Udgående moms 25%',
     nameEnglish: 'Output VAT 25%',
     rate: 0.25,
@@ -28,8 +28,34 @@ export const VAT_CODE_CONFIG: Record<VATCode, VATCodeConfig> = {
     deductible: false,
     description: 'Moms på salg af varer og ydelser i Danmark',
   },
-  K25: {
+  UEU: {
-    code: 'K25',
+    code: 'UEU',
+    nameDanish: 'EU-salg',
+    nameEnglish: 'EU sales (0%)',
+    rate: 0,
+    type: 'exempt',
+    affectsBoxes: {
+      basisBox: '2',
+    },
+    reverseCharge: false,
+    deductible: false,
+    description: 'Salg af varer og ydelser til andre EU-lande',
+  },
+  UEXP: {
+    code: 'UEXP',
+    nameDanish: 'Eksport',
+    nameEnglish: 'Export (0%)',
+    rate: 0,
+    type: 'exempt',
+    affectsBoxes: {
+      basisBox: '2',
+    },
+    reverseCharge: false,
+    deductible: false,
+    description: 'Eksport til lande uden for EU',
+  },
+  I25: {
+    code: 'I25',
     nameDanish: 'Indgående moms 25%',
     nameEnglish: 'Input VAT 25%',
     rate: 0.25,
@@ -41,10 +67,10 @@ export const VAT_CODE_CONFIG: Record<VATCode, VATCodeConfig> = {
     deductible: true,
     description: 'Fradragsberettiget moms på køb',
   },
-  EU_VARE: {
+  IEUV: {
-    code: 'EU_VARE',
+    code: 'IEUV',
-    nameDanish: 'EU-varekøb (erhvervelsesmoms)',
+    nameDanish: 'EU-erhvervelse varer',
-    nameEnglish: 'EU goods purchase (acquisition VAT)',
+    nameEnglish: 'EU goods acquisition (reverse charge)',
     rate: 0.25,
     type: 'reverse_charge',
     affectsBoxes: {
@@ -52,13 +78,13 @@ export const VAT_CODE_CONFIG: Record<VATCode, VATCodeConfig> = {
       basisBox: '3',
     },
     reverseCharge: true,
-    deductible: true, // Both output and input VAT
+    deductible: true,
     description: 'Køb af varer fra andre EU-lande med omvendt betalingspligt',
   },
-  EU_YDELSE: {
+  IEUY: {
-    code: 'EU_YDELSE',
+    code: 'IEUY',
-    nameDanish: 'EU-ydelseskøb (omvendt betalingspligt)',
+    nameDanish: 'EU-erhvervelse ydelser',
-    nameEnglish: 'EU services purchase (reverse charge)',
+    nameEnglish: 'EU services acquisition (reverse charge)',
     rate: 0.25,
     type: 'reverse_charge',
     affectsBoxes: {
@@ -69,34 +95,43 @@ export const VAT_CODE_CONFIG: Record<VATCode, VATCodeConfig> = {
     deductible: true,
     description: 'Køb af ydelser fra udlandet med omvendt betalingspligt',
   },
-  MOMSFRI: {
+  IVV: {
-    code: 'MOMSFRI',
+    code: 'IVV',
-    nameDanish: 'Momsfritaget',
+    nameDanish: 'Import varer verden',
-    nameEnglish: 'VAT exempt',
+    nameEnglish: 'Import goods (world)',
     rate: 0,
-    type: 'exempt',
+    type: 'input',
-    affectsBoxes: {
+    affectsBoxes: {},
-      basisBox: '2',
-    },
     reverseCharge: false,
     deductible: false,
-    description: 'Momsfritaget salg (sundhed, undervisning, mv.)',
+    description: 'Import af varer fra lande uden for EU',
   },
-  EKSPORT: {
+  IVY: {
-    code: 'EKSPORT',
+    code: 'IVY',
-    nameDanish: 'Eksport (0%)',
+    nameDanish: 'Import ydelser verden',
-    nameEnglish: 'Export (0%)',
+    nameEnglish: 'Import services (world)',
     rate: 0,
-    type: 'exempt',
+    type: 'input',
-    affectsBoxes: {
+    affectsBoxes: {},
-      basisBox: '2',
-    },
     reverseCharge: false,
     deductible: false,
-    description: 'Eksport til lande uden for EU',
+    description: 'Import af ydelser fra lande uden for EU',
   },
-  NONE: {
+  REP: {
-    code: 'NONE',
+    code: 'REP',
+    nameDanish: 'Repræsentation',
+    nameEnglish: 'Representation (25%, 25% deductible)',
+    rate: 0.25,
+    type: 'input',
+    affectsBoxes: {
+      vatBox: 'B',
+    },
+    reverseCharge: false,
+    deductible: true,
+    description: 'Repræsentationsudgifter med 25% fradrag',
+  },
+  INGEN: {
+    code: 'INGEN',
     nameDanish: 'Ingen moms',
     nameEnglish: 'No VAT',
     rate: 0,
@@ -231,7 +266,7 @@ export const SKAT_VAT_BOXES: Record<VATBoxId | BasisBoxId, SKATVATBox> = {
  */
 export const VAT_ACCOUNTS = {
   inputVAT: '5610',    // Indgående moms (fradrag)
-  outputVAT: '5710',   // Udgående moms (skyld)
+  outputVAT: '5611',   // Udgående moms (skyld)
   euVAT: '5620',       // EU-moms (erhvervelsesmoms)
 } as const;
 
@@ -243,7 +278,7 @@ export const VAT_ACCOUNTS = {
  * Valid VAT code values for validation
  */
 export const VALID_VAT_CODES: readonly VATCode[] = [
-  'S25', 'K25', 'EU_VARE', 'EU_YDELSE', 'MOMSFRI', 'EKSPORT', 'NONE'
+  'U25', 'UEU', 'UEXP', 'I25', 'IEUV', 'IEUY', 'IVV', 'IVY', 'REP', 'INGEN'
 ] as const;
 
 /**
@@ -254,17 +289,17 @@ export function isValidVATCode(code: unknown): code is VATCode {
 }
 
 /**
- * Safely convert a string to VATCode, returns 'NONE' if invalid
+ * Safely convert a string to VATCode, returns 'INGEN' if invalid
  */
 export function toVATCode(code: unknown): VATCode {
-  return isValidVATCode(code) ? code : 'NONE';
+  return isValidVATCode(code) ? code : 'INGEN';
 }
 
 /**
  * Get VAT code configuration
  */
 export function getVATCodeConfig(code: VATCode): VATCodeConfig {
-  return VAT_CODE_CONFIG[code];
+  return VAT_CODE_CONFIG[code] ?? VAT_CODE_CONFIG['INGEN'];
 }
 
 /**
@@ -328,21 +363,21 @@ export function getSKATBox(boxId: VATBoxId | BasisBoxId): SKATVATBox {
  * Check if a VAT code is deductible (affects input VAT)
  */
 export function isVATDeductible(code: VATCode): boolean {
-  return VAT_CODE_CONFIG[code].deductible;
+  return VAT_CODE_CONFIG[code]?.deductible ?? false;
 }
 
 /**
  * Check if a VAT code is reverse charge
  */
 export function isReverseCharge(code: VATCode): boolean {
-  return VAT_CODE_CONFIG[code].reverseCharge;
+  return VAT_CODE_CONFIG[code]?.reverseCharge ?? false;
 }
 
 /**
  * Get VAT rate for a code
  */
 export function getVATRate(code: VATCode): number {
-  return VAT_CODE_CONFIG[code].rate;
+  return VAT_CODE_CONFIG[code]?.rate ?? 0;
 }
 
 /**

frontend/src/pages/Bankafstemning.tsx

@@ -30,6 +30,7 @@ import {
   BulbOutlined,
 } from '@ant-design/icons';
 import dayjs from 'dayjs';
+import { useNavigate } from 'react-router-dom';
 import { useCompany } from '@/hooks/useCompany';
 import { useReconciliationStore } from '@/stores/reconciliationStore';
 import { useCompanyStore } from '@/stores/companyStore';
@@ -67,6 +68,7 @@ interface MatchSuggestion {
 
 export default function Bankafstemning() {
   const { company } = useCompany();
+  const navigate = useNavigate();
   const { activeCompany } = useCompanyStore();
 
   // Fetch data from API
@@ -218,10 +220,15 @@ export default function Bankafstemning() {
   if (isLoading) {
     return (
       <div>
+        <PageHeader
+          title="Bankafstemning"
+          subtitle={company?.name}
+          breadcrumbs={[{ title: 'Bank' }, { title: 'Bankafstemning' }]}
+        />
         <Skeleton active paragraph={{ rows: 2 }} />
         <Row gutter={16} style={{ marginTop: 16 }}>
-          <Col span={12}><Skeleton active paragraph={{ rows: 8 }} /></Col>
+          <Col xs={24} lg={12}><Skeleton active paragraph={{ rows: 8 }} /></Col>
-          <Col span={12}><Skeleton active paragraph={{ rows: 8 }} /></Col>
+          <Col xs={24} lg={12}><Skeleton active paragraph={{ rows: 8 }} /></Col>
         </Row>
       </div>
     );
@@ -230,9 +237,20 @@ export default function Bankafstemning() {
   // Empty state - no bank connections
   if (bankAccounts.length === 0) {
     return (
-      <Empty
+      <div>
-        description="Ingen bankforbindelser. Opret forbindelse til din bank under Indstillinger."
+        <PageHeader
-      />
+          title="Bankafstemning"
+          subtitle={company?.name}
+          breadcrumbs={[{ title: 'Bank' }, { title: 'Bankafstemning' }]}
+        />
+        <Empty
+          description="Ingen bankforbindelser. Opret forbindelse til din bank under Indstillinger."
+        >
+          <Button type="primary" onClick={() => navigate('/indstillinger')}>
+            Gå til indstillinger
+          </Button>
+        </Empty>
+      </div>
     );
   }
 
@@ -241,7 +259,7 @@ export default function Bankafstemning() {
       <PageHeader
         title="Bankafstemning"
         subtitle={company?.name}
-        breadcrumbs={[{ title: 'Bank', path: '/bankafstemning' }, { title: 'Bankafstemning' }]}
+        breadcrumbs={[{ title: 'Bank' }, { title: 'Bankafstemning' }]}
         extra={
           <Space>
             <Button
@@ -283,13 +301,13 @@ export default function Bankafstemning() {
         <RangePicker
           value={dateRange}
           onChange={(dates) => setDateRange(dates as [dayjs.Dayjs, dayjs.Dayjs])}
-          format="DD/MM/YYYY"
+          format="DD-MM-YYYY"
         />
       </Space>
 
       {/* Summary */}
       <Row gutter={16} style={{ marginBottom: 16 }}>
-        <Col span={8}>
+        <Col xs={24} sm={8}>
           <Card size="small">
             <Statistic
               title="Bank (uafstemt)"
@@ -302,7 +320,7 @@ export default function Bankafstemning() {
             />
           </Card>
         </Col>
-        <Col span={8}>
+        <Col xs={24} sm={8}>
           <Card size="small">
             <Statistic
               title="Bogføring (uafstemt)"
@@ -315,10 +333,10 @@ export default function Bankafstemning() {
             />
           </Card>
         </Col>
-        <Col span={8}>
+        <Col xs={24} sm={8}>
           <Card size="small">
             <Statistic
-              title="Difference"
+              title="Differens"
               value={difference}
               precision={2}
               formatter={(value) => formatCurrency(value as number)}
@@ -372,7 +390,7 @@ export default function Bankafstemning() {
       {/* Side-by-side panels */}
       <Row gutter={16}>
         {/* Bank Transactions */}
-        <Col span={12}>
+        <Col xs={24} lg={12}>
           <Card
             title={
               <Space>
@@ -483,7 +501,7 @@ export default function Bankafstemning() {
         </Col>
 
         {/* Ledger Entries */}
-        <Col span={12}>
+        <Col xs={24} lg={12}>
           <Card
             title={
               <Space>
@@ -496,7 +514,7 @@ export default function Bankafstemning() {
           >
             {ledgerEntries.length === 0 ? (
               <Empty
-                description="Ingen uafstemte bogføringsposter (API ikke implementeret endnu)"
+                description="Ingen uafstemte bogføringsposter"
                 style={{ padding: 24 }}
               />
             ) : (
@@ -650,7 +668,7 @@ export default function Bankafstemning() {
             label="Dato"
             rules={[{ required: true }]}
           >
-            <DatePicker format="DD/MM/YYYY" style={{ width: '100%' }} />
+            <DatePicker format="DD-MM-YYYY" style={{ width: '100%' }} />
           </Form.Item>
           <Form.Item
             name="description"

frontend/src/pages/CompanySetupWizard.tsx

@@ -140,7 +140,6 @@ export default function CompanySetupWizard() {
 
       setCurrentStep(4); // Success step
     } catch (error) {
-      console.error('Company creation failed:', error);
       showError(error, 'Kunne ikke oprette virksomhed');
     }
   };

frontend/src/pages/Dashboard.tsx

@@ -1,4 +1,4 @@
-import { Row, Col, Card, Statistic, Typography, Space, Tag, Progress, Skeleton, Empty } from 'antd';
+import { Row, Col, Card, Statistic, Typography, Space, Tag, Skeleton, Empty } from 'antd';
 import {
   BankOutlined,
   FileTextOutlined,
@@ -154,7 +154,11 @@ export default function Dashboard() {
   if (isLoading) {
     return (
       <div>
-        <Skeleton active paragraph={{ rows: 1 }} />
+        <PageHeader
+          title="Dashboard"
+          subtitle={company?.name}
+          breadcrumbs={[{ title: 'Dashboard' }]}
+        />
         <Row gutter={[16, 16]} style={{ marginTop: 16 }}>
           <Col xs={24} sm={12} lg={6}>
             <Card size="small"><Skeleton active paragraph={{ rows: 2 }} /></Card>
@@ -367,14 +371,8 @@ export default function Dashboard() {
                 value={metrics.unreconciledCount}
                 prefix={<FileTextOutlined />}
               />
-              <Progress
+              <Text type="secondary" style={{ display: 'block', marginTop: 16 }}>
-                percent={metrics.unreconciledCount === 0 ? 100 : 75}
+                Bankafstemning er ikke tilgængelig endnu
-                status="active"
-                strokeColor={accountingColors.balance}
-                style={{ marginTop: 16 }}
-              />
-              <Text type="secondary">
-                {metrics.unreconciledCount === 0 ? '100% afstemt' : 'Bankafstemning ikke implementeret endnu'}
               </Text>
             </div>
           </Card>

frontend/src/pages/Fakturaer.tsx

@@ -469,7 +469,7 @@ export default function Fakturaer() {
       <PageHeader
         title="Fakturaer"
         subtitle={company?.name}
-        breadcrumbs={[{ title: 'Fakturering', path: '/fakturaer' }, { title: 'Fakturaer' }]}
+        breadcrumbs={[{ title: 'Fakturering' }, { title: 'Fakturaer' }]}
         extra={
           <Button type="primary" icon={<PlusOutlined />} onClick={handleCreateInvoice}>
             Ny fakturakladde

frontend/src/pages/Kassekladde.tsx

@@ -199,7 +199,7 @@ export default function Kassekladde() {
           return <Tag color="red">Annulleret</Tag>;
         }
         return value ? (
-          <Tag color="green">Bogfort</Tag>
+          <Tag color="green">Bogført</Tag>
         ) : (
           <Tag color="orange">Kladde</Tag>
         );
@@ -301,7 +301,7 @@ export default function Kassekladde() {
       case 'void':
         Modal.confirm({
           title: 'Annuller bilag',
-          content: `Er du sikker pa at du vil annullere bilag ${record.transactionNumber}?`,
+          content: `Er du sikker på at du vil annullere bilag ${record.transactionNumber}?`,
           okText: 'Annuller bilag',
           okType: 'danger',
           cancelText: 'Fortryd',
@@ -352,7 +352,7 @@ export default function Kassekladde() {
       const validation = validateDoubleEntry(lines as TransactionLine[]);
       if (!validation.valid) {
         message.error(
-          `Debet (${formatCurrency(validation.totalDebit)}) skal vaere lig kredit (${formatCurrency(validation.totalCredit)})`
+          `Debet (${formatCurrency(validation.totalDebit)}) skal være lig kredit (${formatCurrency(validation.totalCredit)})`
         );
         return;
       }
@@ -430,7 +430,7 @@ export default function Kassekladde() {
 
   const getStatusLabel = (status: JournalEntryDraftStatus): { label: string; color: string } => {
     switch (status) {
-      case 'posted': return { label: 'Bogfort', color: 'green' };
+      case 'posted': return { label: 'Bogført', color: 'green' };
       case 'discarded': return { label: 'Annulleret', color: 'red' };
       case 'draft': return { label: 'Kladde', color: 'orange' };
       case 'pending_review': return { label: 'Afventer gennemgang', color: 'blue' };
@@ -447,7 +447,7 @@ export default function Kassekladde() {
         <PageHeader
           title="Kassekladde"
           subtitle={activeCompany?.name}
-          breadcrumbs={[{ title: 'Bogforing', path: '/kontooversigt' }, { title: 'Kassekladde' }]}
+          breadcrumbs={[{ title: 'Bogføring', path: '/kontooversigt' }, { title: 'Kassekladde' }]}
         />
         <Skeleton active paragraph={{ rows: 10 }} />
       </div>
@@ -459,7 +459,7 @@ export default function Kassekladde() {
       <PageHeader
         title="Kassekladde"
         subtitle={activeCompany?.name}
-        breadcrumbs={[{ title: 'Bogforing', path: '/kontooversigt' }, { title: 'Kassekladde' }]}
+        breadcrumbs={[{ title: 'Bogføring', path: '/kontooversigt' }, { title: 'Kassekladde' }]}
         extra={
           <Button
             type="primary"
@@ -504,7 +504,7 @@ export default function Kassekladde() {
               value={statusFilter}
               onChange={(value) => setStatusFilter(value ?? null)}
               options={[
-                { value: 'posted', label: 'Bogfort' },
+                { value: 'posted', label: 'Bogført' },
                 { value: 'draft', label: 'Kladde' },
                 { value: 'discarded', label: 'Annulleret' },
               ]}
@@ -569,12 +569,12 @@ export default function Kassekladde() {
                 </Tag>
               </Descriptions.Item>
               {detailDraft.isReconciled && detailDraft.postedAt && (
-                <Descriptions.Item label="Bogfort">
+                <Descriptions.Item label="Bogført">
                   {dayjs(detailDraft.postedAt).format('DD-MM-YYYY HH:mm')}
                 </Descriptions.Item>
               )}
               {detailDraft.postedBy && (
-                <Descriptions.Item label="Bogfort af">
+                <Descriptions.Item label="Bogført af">
                   {detailDraft.postedBy}
                 </Descriptions.Item>
               )}
@@ -647,7 +647,7 @@ export default function Kassekladde() {
               <Form.Item
                 name="date"
                 label="Dato"
-                rules={[{ required: true, message: 'Vaelg dato' }]}
+                rules={[{ required: true, message: 'Vælg dato' }]}
                 initialValue={dayjs()}
               >
                 <DatePicker format="DD-MM-YYYY" style={{ width: 150 }} />
@@ -683,7 +683,7 @@ export default function Kassekladde() {
                       <td style={{ padding: 4 }}>
                         <Select
                           style={{ width: '100%' }}
-                          placeholder="Vaelg konto"
+                          placeholder="Vælg konto"
                           showSearch
                           optionFilterProp="label"
                           value={line.accountId}
@@ -752,7 +752,7 @@ export default function Kassekladde() {
                   <tr style={{ borderTop: '2px solid #f0f0f0' }}>
                     <td style={{ padding: 8 }}>
                       <Button type="dashed" size="small" onClick={handleAddLine}>
-                        + Tilf&oslash;j linje
+                        + Tilføj linje
                       </Button>
                     </td>
                     <td
@@ -775,7 +775,7 @@ export default function Kassekladde() {
                     </td>
                     <td colSpan={2} style={{ padding: 8 }}>
                       {!balance.valid && (
-                        <Tooltip title={`Difference: ${formatCurrency(balance.difference)}`}>
+                        <Tooltip title={`Differens: ${formatCurrency(balance.difference)}`}>
                           <Tag color="red">Ubalance!</Tag>
                         </Tooltip>
                       )}

frontend/src/pages/Kontooversigt.tsx

@@ -17,6 +17,7 @@ import {
   Switch,
   Divider,
   Descriptions,
+  Tooltip,
 } from 'antd';
 import {
   PlusOutlined,
@@ -128,13 +129,6 @@ export default function Kontooversigt() {
     setIsDrawerOpen(true);
   };
 
-  const handleEditAccount = () => {
-    if (selectedAccount) {
-      form.setFieldsValue(selectedAccount);
-      setIsEditMode(true);
-    }
-  };
-
   const handleCloseDrawer = () => {
     setIsDrawerOpen(false);
     setIsEditMode(false);
@@ -367,9 +361,11 @@ export default function Kontooversigt() {
         onClose={handleCloseDrawer}
         extra={
           !isEditMode && selectedAccount && (
-            <Button type="primary" icon={<EditOutlined />} onClick={handleEditAccount}>
+            <Tooltip title="Redigering kommer snart">
-              Rediger
+              <Button type="primary" icon={<EditOutlined />} disabled>
-            </Button>
+                Rediger
+              </Button>
+            </Tooltip>
           )
         }
         footer={

frontend/src/pages/Kreditnotaer.tsx

@@ -442,7 +442,7 @@ export default function Kreditnotaer() {
       <PageHeader
         title="Kreditnotaer"
         subtitle={company?.name}
-        breadcrumbs={[{ title: 'Salg' }, { title: 'Kreditnotaer' }]}
+        breadcrumbs={[{ title: 'Fakturering' }, { title: 'Kreditnotaer' }]}
         extra={
           <Button type="primary" icon={<PlusOutlined />} onClick={handleCreateCreditNote}>
             Ny kreditnota

frontend/src/pages/Kunder.tsx

@@ -173,8 +173,12 @@ export default function Kunder() {
         await updateCustomerMutation.mutateAsync(input);
         showSuccess('Kunde opdateret');
       } else {
+        if (!company) {
+          showError(new Error('Ingen virksomhed valgt'));
+          return;
+        }
         const input: CreateCustomerInput = {
-          companyId: company!.id,
+          companyId: company.id,
           customerType: values.customerType.toUpperCase() as 'BUSINESS' | 'PRIVATE',
           name: values.name,
           cvr: values.cvr || undefined,

frontend/src/pages/Loenforstaelse.tsx

@@ -13,6 +13,7 @@ import {
   Button,
   Descriptions,
   Collapse,
+  Tooltip,
 } from 'antd';
 import {
   TeamOutlined,
@@ -279,7 +280,9 @@ export default function Loenforstaelse() {
         subtitle={company?.name}
         breadcrumbs={[{ title: 'Løn' }, { title: 'Lønforståelse' }]}
         extra={
-          <Button icon={<DownloadOutlined />}>Eksporter lønsedler</Button>
+          <Tooltip title="Eksport er endnu ikke implementeret">
+            <Button icon={<DownloadOutlined />} disabled>Eksporter lønsedler</Button>
+          </Tooltip>
         }
       />
 

frontend/src/pages/Ordrer.tsx

@@ -9,6 +9,7 @@ import {
   Modal,
   Form,
   Input,
+  InputNumber,
   Select,
   Skeleton,
   Alert,
@@ -696,7 +697,7 @@ export default function Ordrer() {
                             <Tag>{line.vatCode}</Tag>
                             {line.isInvoiced && line.invoicedAt && (
                               <Tag color="blue">
-                                Faktureret: {dayjs(line.invoicedAt).format('DD/MM/YYYY')}
+                                Faktureret: {dayjs(line.invoicedAt).format('DD-MM-YYYY')}
                               </Tag>
                             )}
                           </Space>
@@ -876,7 +877,7 @@ export default function Ordrer() {
                 label="Antal"
                 rules={[{ required: true, message: 'Angiv antal' }]}
               >
-                <Input type="number" min={0} step={1} />
+                <InputNumber min={0} step={1} style={{ width: '100%' }} />
               </Form.Item>
             </Col>
             <Col span={8}>
@@ -893,10 +894,10 @@ export default function Ordrer() {
                 label="Enhedspris"
                 rules={[{ required: true, message: 'Angiv pris' }]}
               >
-                <Input
+                <InputNumber
-                  type="number"
                   min={0}
                   step={0.01}
+                  style={{ width: '100%' }}
                   disabled={addLineMode === 'product' && !!selectedProductId}
                 />
               </Form.Item>
@@ -905,7 +906,7 @@ export default function Ordrer() {
           <Row gutter={16}>
             <Col span={12}>
               <Form.Item name="discountPercent" label="Rabat (%)">
-                <Input type="number" min={0} max={100} step={1} />
+                <InputNumber min={0} max={100} step={1} style={{ width: '100%' }} />
               </Form.Item>
             </Col>
             <Col span={12}>

frontend/src/pages/Produkter.tsx

@@ -173,8 +173,12 @@ export default function Produkter() {
         await updateProductMutation.mutateAsync(input);
         showSuccess('Produkt opdateret');
       } else {
+        if (!company) {
+          showError(new Error('Ingen virksomhed valgt'));
+          return;
+        }
         const input: CreateProductInput = {
-          companyId: company!.id,
+          companyId: company.id,
           productNumber: values.productNumber || undefined,
           name: values.name,
           description: values.description || undefined,

frontend/src/pages/Settings.tsx

@@ -12,6 +12,7 @@ import {
   Divider,
   message,
   Space,
+  Tooltip,
 } from 'antd';
 import {
   SaveOutlined,
@@ -61,19 +62,6 @@ export default function Settings() {
     }
   };
 
-  const handleSavePreferences = async () => {
-    try {
-      await preferencesForm.validateFields();
-      // TODO: Backend does not yet have a preferences mutation.
-      // Preferences like VAT period, auto-reconcile, etc. need a dedicated backend endpoint.
-      message.info('Præferencer er endnu ikke forbundet til backend');
-    } catch (error) {
-      if (error instanceof Error) {
-        message.error(`Fejl ved gemning: ${error.message}`);
-      }
-    }
-  };
-
   const tabItems = [
     {
       key: 'company',
@@ -278,9 +266,11 @@ export default function Settings() {
             </Row>
 
             <div style={{ textAlign: 'right' }}>
-              <Button type="primary" icon={<SaveOutlined />} onClick={handleSavePreferences}>
+              <Tooltip title="Præferencer er endnu ikke forbundet til backend">
-                Gem præferencer
+                <Button type="primary" icon={<SaveOutlined />} disabled>
-              </Button>
+                  Gem præferencer
+                </Button>
+              </Tooltip>
             </div>
           </Form>
         </Card>

frontend/src/pages/UserSettings.tsx

@@ -28,6 +28,7 @@ import {
 import type { UploadProps } from 'antd';
 import { spacing } from '@/styles/designTokens';
 import { PageHeader } from '@/components/shared/PageHeader';
+import { DemoDataDisclaimer } from '@/components/shared/DemoDataDisclaimer';
 
 const { Title, Text } = Typography;
 
@@ -461,6 +462,8 @@ export default function UserSettings() {
         breadcrumbs={[{ title: 'Brugerindstillinger' }]}
       />
 
+      <DemoDataDisclaimer message="Brugerindstillinger er endnu ikke forbundet til backend. Ændringer gemmes ikke." />
+
       <Tabs items={tabItems} />
     </div>
   );

frontend/src/types/vat.ts

@@ -10,13 +10,24 @@ import type { VATPeriodicitet } from './periods';
  * VAT codes used in Danish bookkeeping
  */
 export type VATCode =
-  | 'S25'         // Salgsmoms 25% (udgaaende moms)
+  | 'U25'         // Udgående moms 25% (salg)
-  | 'K25'         // Koebsmoms 25% (indgaaende moms)
+  | 'UEU'         // EU-salg (0%)
-  | 'EU_VARE'     // EU-varekoeb (reverse charge)
+  | 'UEXP'        // Eksport (0%)
-  | 'EU_YDELSE'   // EU-ydelseskoeb (reverse charge)
+  | 'I25'         // Indgående moms 25% (køb)
-  | 'MOMSFRI'     // Momsfritaget (healthcare, education, etc.)
+  | 'IEUV'        // EU-erhvervelse varer (reverse charge)
-  | 'EKSPORT'     // Eksport (0%)
+  | 'IEUY'        // EU-erhvervelse ydelser (reverse charge)
-  | 'NONE';       // Ingen moms
+  | 'IVV'         // Import varer verden (0%)
+  | 'IVY'         // Import ydelser verden (0%)
+  | 'REP'         // Repræsentation (25%, 25% fradrag)
+  | 'INGEN'       // Ingen moms
+  // Legacy codes kept for backwards compatibility with other modules
+  | 'S25'         // @deprecated Use U25
+  | 'K25'         // @deprecated Use I25
+  | 'EU_VARE'     // @deprecated Use IEUV
+  | 'EU_YDELSE'   // @deprecated Use IEUY
+  | 'MOMSFRI'     // @deprecated Use INGEN
+  | 'EKSPORT'     // @deprecated Use UEXP
+  | 'NONE';       // @deprecated Use INGEN
 
 /**
  * VAT code type classification