sales & grn fixers

Backend/ERPCore/Services/CustomerService.cs

@@ -16,19 +16,37 @@ public sealed class CustomerService : ICustomerService
     private readonly IRepository<Customer> _customers;
     private readonly IRepository<Warehouse> _warehouses;
     private readonly IBranchConfigService _branchConfig;
+    private readonly IRepository<SalesConfig> _salesConfig;
     private readonly IUnitOfWork _uow;
 
-    public CustomerService(IRepository<Customer> customers, IRepository<Warehouse> warehouses, IBranchConfigService branchConfig, IUnitOfWork uow)
+    /// <summary>Code of the system "Cash Customer" row (see <see cref="SalesConfigService"/>).</summary>
+    private const string CashCustomerCode = "CUST-CASH";
+
+    public CustomerService(
+        IRepository<Customer> customers, IRepository<Warehouse> warehouses, IBranchConfigService branchConfig,
+        IRepository<SalesConfig> salesConfig, IUnitOfWork uow)
     {
         _customers = customers;
         _warehouses = warehouses;
         _branchConfig = branchConfig;
+        _salesConfig = salesConfig;
         _uow = uow;
     }
 
-    public async Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, CancellationToken ct = default)
+    public async Task<PagedResponse<CustomerDto>> ListAsync(
+        PageQuery query, EntityStatus? status, CustomerType? customerType, bool includeCashCustomer = false, CancellationToken ct = default)
     {
         var q = _customers.Query().AsNoTracking();
+        // The generic cash customer is a system default for walk-in / one-time buyers, not a registered
+        // customer — kept out of customer lists unless a caller asks for it (e.g. to resolve names).
+        if (!includeCashCustomer)
+        {
+            var cashCustomerId = await _salesConfig.Query().AsNoTracking()
+                .Where(c => c.ConfigId == SalesConfig.SingletonId)
+                .Select(c => c.CashCustomerId)
+                .FirstOrDefaultAsync(ct);
+            q = q.Where(c => c.CustomerCode != CashCustomerCode && (cashCustomerId == null || c.CustomerId != cashCustomerId));
+        }
         if (!string.IsNullOrWhiteSpace(query.Q))
         {
             var term = query.Q.Trim();

Backend/ERPCore/Services/GrnConfigService.cs

@@ -0,0 +1,100 @@
+using ERPCore.Common.Http;
+using ERPCore.Domain;
+using ERPCore.Domain.Entities;
+using ERPCore.Dtos.Config;
+using ERPCore.Infra.Auth;
+using ERPCore.Infra.UoW;
+using ERPCore.Repositories.Interfaces;
+using ERPCore.Services.Interfaces;
+using ERPCore.System.Errors;
+using Microsoft.EntityFrameworkCore;
+
+namespace ERPCore.Services;
+
+/// <summary>GRN configuration service over the singleton row seeded by DataSeeder.</summary>
+public sealed class GrnConfigService : IGrnConfigService
+{
+    private readonly IRepository<GrnConfig> _config;
+    private readonly IRepository<Warehouse> _warehouses;
+    private readonly ICurrentUser _currentUser;
+    private readonly IUnitOfWork _uow;
+
+    public GrnConfigService(
+        IRepository<GrnConfig> config, IRepository<Warehouse> warehouses, ICurrentUser currentUser, IUnitOfWork uow)
+    {
+        _config = config;
+        _warehouses = warehouses;
+        _currentUser = currentUser;
+        _uow = uow;
+    }
+
+    public async Task<ETagged<GrnConfigDto>> GetAsync(CancellationToken ct = default)
+    {
+        var config = await _config.Query().AsNoTracking().Include(c => c.DefaultWarehouse)
+            .FirstOrDefaultAsync(c => c.ConfigId == GrnConfig.SingletonId, ct)
+            ?? throw new NotFoundException("GRN configuration has not been seeded.");
+
+        return new ETagged<GrnConfigDto>(Map(config), config.RowVersion);
+    }
+
+    public async Task<ETagged<GrnConfigDto>> UpdateAsync(
+        UpdateGrnConfigRequest request, uint expectedRowVersion, CancellationToken ct = default)
+    {
+        var config = await _config.GetByIdAsync(GrnConfig.SingletonId, ct)
+            ?? throw new NotFoundException("GRN configuration has not been seeded.");
+
+        if (config.RowVersion != expectedRowVersion)
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The configuration was modified by another request.", 412);
+
+        var allowWarehouseSelection = request.AllowWarehouseSelection!.Value;
+        if (!allowWarehouseSelection && request.DefaultWarehouseId is null)
+            throw new DomainException(ErrorCodes.Validation, "Pick a default receiving warehouse before turning warehouse selection off.", 422);
+        if (request.DefaultWarehouseId is int defaultWarehouseId
+            && !await _warehouses.Query().AnyAsync(w => w.WarehouseId == defaultWarehouseId, ct))
+            throw new NotFoundException($"Warehouse {defaultWarehouseId} was not found.");
+
+        config.AllowWarehouseSelection = allowWarehouseSelection;
+        config.DefaultWarehouseId = request.DefaultWarehouseId;
+        config.AllowDiscounts = request.AllowDiscounts!.Value;
+        config.AllowVat = request.AllowVat!.Value;
+        config.UpdatedAt = DateTime.UtcNow;
+        config.UpdatedBy = _currentUser.AuditUserId;
+
+        try
+        {
+            await _uow.SaveChangesAsync(ct);
+        }
+        catch (DbUpdateConcurrencyException)
+        {
+            throw new DomainException(ErrorCodes.ConcurrencyConflict, "The configuration was modified by another request.", 412);
+        }
+
+        return await GetAsync(ct);
+    }
+
+    public async Task<int?> GetForcedWarehouseIdAsync(CancellationToken ct = default)
+    {
+        var config = await _config.Query().AsNoTracking()
+            .Where(c => c.ConfigId == GrnConfig.SingletonId)
+            .Select(c => new { c.AllowWarehouseSelection, c.DefaultWarehouseId })
+            .FirstOrDefaultAsync(ct);
+        if (config is null) return null;
+        // A saved default receiving warehouse always wins — GRNs use only that warehouse.
+        if (config.DefaultWarehouseId is int defaultWarehouseId) return defaultWarehouseId;
+        if (config.AllowWarehouseSelection) return null;
+        // The FK is SetNull on delete, so the default can disappear after it was configured.
+        throw new DomainException(ErrorCodes.Validation, "Warehouse selection is turned off in GRN Configuration but no default receiving warehouse is set.", 422);
+    }
+
+    public async Task<(bool AllowDiscounts, bool AllowVat)> GetLineOptionsAsync(CancellationToken ct = default)
+    {
+        var config = await _config.Query().AsNoTracking()
+            .Where(c => c.ConfigId == GrnConfig.SingletonId)
+            .Select(c => new { c.AllowDiscounts, c.AllowVat })
+            .FirstOrDefaultAsync(ct);
+        return config is null ? (true, true) : (config.AllowDiscounts, config.AllowVat);
+    }
+
+    private static GrnConfigDto Map(GrnConfig c) => new(
+        c.AllowWarehouseSelection, c.DefaultWarehouseId, c.DefaultWarehouse?.Name, c.AllowDiscounts, c.AllowVat, c.UpdatedAt, c.UpdatedBy);
+}

Backend/ERPCore/Services/GrnService.cs

@@ -40,6 +40,7 @@ public sealed class GrnService : IGrnService
     private readonly INumberSequenceService _numbers;
     private readonly ICurrentUser _currentUser;
     private readonly IBranchConfigService _branchConfig;
+    private readonly IGrnConfigService _grnConfig;
     private readonly IUnitOfWork _uow;
     private readonly IGeneralLedgerService _gl;
     private readonly INotificationService _notifications;
@@ -52,7 +53,7 @@ public sealed class GrnService : IGrnService
         IRepository<Item> items, IRepository<Warehouse> warehouses,
         IRepository<Bin> bins, IRepository<Vendor> vendors, IRepository<Batch> batches,
         IRepository<StockLayer> layers, IRepository<StockLedger> ledger, IRepository<TaxRate> taxRates,
-        IFifoCostingService fifo, INumberSequenceService numbers, ICurrentUser currentUser, IBranchConfigService branchConfig,
+        IFifoCostingService fifo, INumberSequenceService numbers, ICurrentUser currentUser, IBranchConfigService branchConfig, IGrnConfigService grnConfig,
         IUnitOfWork uow, IGeneralLedgerService gl, INotificationService notifications, IConfiguration configuration)
     {
         _grns = grns;
@@ -70,6 +71,7 @@ public sealed class GrnService : IGrnService
         _numbers = numbers;
         _currentUser = currentUser;
         _branchConfig = branchConfig;
+        _grnConfig = grnConfig;
         _uow = uow;
         _gl = gl;
         _notifications = notifications;
@@ -118,6 +120,10 @@ public sealed class GrnService : IGrnService
 
     public async Task<GrnDto> CreateAsync(CreateGrnRequest request, CancellationToken ct = default)
     {
+        // GRN Configuration default receiving warehouse: whatever the client sent, the GRN uses it.
+        if (await _grnConfig.GetForcedWarehouseIdAsync(ct) is int forcedWarehouseId)
+            request.WarehouseId = forcedWarehouseId;
+
         if (!await _warehouses.Query().AnyAsync(w => w.WarehouseId == request.WarehouseId, ct))
             throw new DomainException(ErrorCodes.Validation, $"Warehouse {request.WarehouseId} does not exist.", 422);
 
@@ -144,6 +150,12 @@ public sealed class GrnService : IGrnService
             vendorId = request.VendorId.Value;
         }
 
+        var (allowDiscounts, allowVat) = await _grnConfig.GetLineOptionsAsync(ct);
+        if (!allowDiscounts && request.Lines.Any(l => l.DiscountPct > 0m))
+            throw new DomainException(ErrorCodes.Validation, "Discounts are turned off in GRN Configuration.", 422);
+        if (!allowVat && request.Lines.Any(l => l.VatPct > 0m))
+            throw new DomainException(ErrorCodes.Validation, "VAT is turned off in GRN Configuration.", 422);
+
         var lines = new List<GrnLine>();
         var batchCache = new Dictionary<(int ItemId, string BatchNo), Batch>();
 
@@ -187,7 +199,8 @@ public sealed class GrnService : IGrnService
             // input.VatPct supplied is an explicit override; omitted (null) resolves from the
             // item's assigned TaxRate — see ISalesDomainService.ResolveLineTaxPctAsync's sales-side
             // equivalent of this same "Item.TaxRate drives the default, don't hand-type it" rule.
-            var vatPct = input.VatPct ?? (item.TaxRateId is int taxRateId
+            // GRN Configuration "Allow VAT" off: every line is 0% — the item's tax rate is not applied either.
+            var vatPct = !allowVat ? 0m : input.VatPct ?? (item.TaxRateId is int taxRateId
                 ? await _taxRates.Query().AsNoTracking().Where(t => t.TaxRateId == taxRateId).Select(t => t.Percentage).FirstAsync(ct)
                 : 0m);
             var vatAmount = Math.Round(receivedValue * vatPct / 100m, 4, MidpointRounding.AwayFromZero);

Backend/ERPCore/Services/Interfaces/ICustomerService.cs

@@ -7,7 +7,8 @@ namespace ERPCore.Services.Interfaces;
 
 public interface ICustomerService
 {
-    Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, CancellationToken ct = default);
+    /// <summary>Registered customers; the system cash customer is left out unless <paramref name="includeCashCustomer"/>.</summary>
+    Task<PagedResponse<CustomerDto>> ListAsync(PageQuery query, EntityStatus? status, CustomerType? customerType, bool includeCashCustomer = false, CancellationToken ct = default);
     Task<ETagged<CustomerDto>?> GetAsync(int customerId, CancellationToken ct = default);
     Task<ETagged<CustomerDto>> CreateAsync(CreateCustomerRequest request, CancellationToken ct = default);
     Task<ETagged<CustomerDto>> UpdateAsync(int customerId, UpdateCustomerRequest request, uint expectedRowVersion, CancellationToken ct = default);

Backend/ERPCore/Services/Interfaces/IGrnConfigService.cs

@@ -0,0 +1,20 @@
+using ERPCore.Common.Http;
+using ERPCore.Dtos.Config;
+
+namespace ERPCore.Services.Interfaces;
+
+/// <summary>GRN configuration business logic. Singleton.</summary>
+public interface IGrnConfigService
+{
+    Task<ETagged<GrnConfigDto>> GetAsync(CancellationToken ct = default);
+
+    Task<ETagged<GrnConfigDto>> UpdateAsync(
+        UpdateGrnConfigRequest request, uint expectedRowVersion, CancellationToken ct = default);
+
+    /// <summary>GRN Configuration default receiving warehouse: when one is saved, every GRN must
+    /// use it. Null only when none is saved and "Allow warehouse selection" is on.</summary>
+    Task<int?> GetForcedWarehouseIdAsync(CancellationToken ct = default);
+
+    /// <summary>Whether GRN lines may carry a discount and VAT (both default to allowed).</summary>
+    Task<(bool AllowDiscounts, bool AllowVat)> GetLineOptionsAsync(CancellationToken ct = default);
+}

Backend/ERPCore/Services/Interfaces/ISalesInvoicePaymentService.cs

@@ -6,5 +6,7 @@ namespace ERPCore.Services.Interfaces;
 public interface ISalesInvoicePaymentService
 {
     Task<SalesInvoicePaymentDto> PayAsync(int salesInvoiceId, CreateSalesInvoicePaymentRequest request, CancellationToken ct = default);
+    /// <summary>One customer, several invoices, one GL journal entry; returns a payment per invoice/account split.</summary>
+    Task<IReadOnlyList<SalesInvoicePaymentDto>> PayBulkAsync(CreateBulkSalesInvoicePaymentRequest request, CancellationToken ct = default);
     Task<IReadOnlyList<SalesInvoicePaymentDto>> ListAsync(int salesInvoiceId, CancellationToken ct = default);
 }

Backend/ERPCore/Services/Interfaces/IStockService.cs

@@ -12,6 +12,9 @@ public interface IStockService
     Task<PagedResponse<StockOnHandDto>> GetOnHandListAsync(
         int? itemId, int? warehouseId, int? branchId, PageQuery query, CancellationToken ct = default);
 
+    /// <summary>Issuable (non-held) stock per item at one warehouse, keyed by item id.</summary>
+    Task<IReadOnlyDictionary<int, decimal>> GetAvailableByItemAsync(int warehouseId, CancellationToken ct = default);
+
     Task<PagedResponse<StockLedgerRowDto>> GetLedgerAsync(
         int? itemId, int? warehouseId, int? branchId, DateOnly? from, DateOnly? to,
         string? sourceDocType, int? sourceDocId, PageQuery query, CancellationToken ct = default);

Backend/ERPCore/Services/SalesInvoicePaymentService.cs

@@ -24,17 +24,19 @@ public sealed class SalesInvoicePaymentService : ISalesInvoicePaymentService
 {
     private readonly IRepository<SalesInvoice> _invoices;
     private readonly IRepository<SalesInvoicePayment> _payments;
+    private readonly IRepository<SalesConfig> _salesConfig;
     private readonly IGeneralLedgerService _gl;
     private readonly ICurrentUser _currentUser;
     private readonly IUnitOfWork _uow;
     private readonly string _glAccountsReceivableCode;
 
     public SalesInvoicePaymentService(
-        IRepository<SalesInvoice> invoices, IRepository<SalesInvoicePayment> payments, IGeneralLedgerService gl,
-        ICurrentUser currentUser, IUnitOfWork uow, IConfiguration configuration)
+        IRepository<SalesInvoice> invoices, IRepository<SalesInvoicePayment> payments, IRepository<SalesConfig> salesConfig,
+        IGeneralLedgerService gl, ICurrentUser currentUser, IUnitOfWork uow, IConfiguration configuration)
     {
         _invoices = invoices;
         _payments = payments;
+        _salesConfig = salesConfig;
         _gl = gl;
         _currentUser = currentUser;
         _uow = uow;
@@ -58,17 +60,18 @@ public sealed class SalesInvoicePaymentService : ISalesInvoicePaymentService
 
         var actor = _currentUser.AuditUserId;
         var now = DateTime.UtcNow;
+        var (paymentDay, paymentDate) = ResolvePaymentDate(request.PaymentDate, now);
 
         var payment = await _uow.ExecuteInTransactionAsync(async token =>
         {
             // Same atomicity approach as GrnPaymentService.PayAsync: post to GL first, inside
             // this transaction, before anything is committed — a GL rejection/timeout rolls
             // the whole payment back with no partial local state.
-            var period = await _gl.GetPeriodByDateAsync(DateOnly.FromDateTime(now), token);
+            var period = await _gl.GetPeriodByDateAsync(paymentDay, token);
             var posted = await _gl.PostJournalEntryAsync(new GlJournalEntryRequest
             {
                 PeriodId = period.PeriodId,
-                EntryDate = DateOnly.FromDateTime(now),
+                EntryDate = paymentDay,
                 SourceModule = "SALES_INVOICE_PAYMENT",
                 Reference = invoice.InvoiceNo,
                 Narration = $"Payment against invoice {invoice.InvoiceNo}",
@@ -83,7 +86,7 @@ public sealed class SalesInvoicePaymentService : ISalesInvoicePaymentService
             {
                 SalesInvoiceId = invoice.SalesInvoiceId,
                 Amount = request.Amount,
-                PaymentDate = now,
+                PaymentDate = paymentDate,
                 GlBankAccountId = account.AccountId,
                 BankAccountName = account.AccountName,
                 Reference = request.Reference,
@@ -102,6 +105,134 @@ public sealed class SalesInvoicePaymentService : ISalesInvoicePaymentService
         return Map(payment);
     }
 
+    public async Task<IReadOnlyList<SalesInvoicePaymentDto>> PayBulkAsync(CreateBulkSalesInvoicePaymentRequest request, CancellationToken ct = default)
+    {
+        var ids = request.SalesInvoiceIds.Distinct().ToList();
+        if (ids.Count == 0 || request.Lines.Count == 0)
+            throw new DomainException(ErrorCodes.Validation, "Select at least one invoice and one payment line.", 400);
+
+        var invoices = await _invoices.Query().Where(i => ids.Contains(i.SalesInvoiceId)).ToListAsync(ct);
+        var missing = ids.Except(invoices.Select(i => i.SalesInvoiceId)).ToList();
+        if (missing.Count > 0)
+            throw new NotFoundException($"Sales invoice {missing[0]} was not found.");
+        if (invoices.Select(i => i.CustomerId).Distinct().Count() > 1)
+            throw new DomainException(ErrorCodes.Validation, "All invoices in one payment must belong to the same customer.", 400);
+
+        // The generic cash customer's invoices are paid one at a time, never grouped.
+        var cashCustomerId = await _salesConfig.Query().AsNoTracking()
+            .Where(c => c.ConfigId == SalesConfig.SingletonId)
+            .Select(c => c.CashCustomerId)
+            .FirstOrDefaultAsync(ct);
+        if (cashCustomerId is not null && invoices[0].CustomerId == cashCustomerId)
+            throw new DomainException(ErrorCodes.Validation, "Cash customer invoices cannot be paid together.", 400);
+
+        foreach (var inv in invoices)
+        {
+            if (inv.Status != SalesInvoiceStatus.Posted)
+                throw new DomainException(ErrorCodes.SalesInvoiceNotPayable, $"Sales invoice {inv.InvoiceNo} must be posted before it can be paid.", 409);
+            if (inv.BalanceAmount <= 0)
+                throw new DomainException(ErrorCodes.SalesInvoiceNotPayable, $"Sales invoice {inv.InvoiceNo} is already fully paid.", 409);
+        }
+
+        var total = request.Lines.Sum(l => l.Amount);
+        var totalBalance = invoices.Sum(i => i.BalanceAmount);
+        if (total > totalBalance)
+            throw new DomainException(ErrorCodes.SalesInvoicePaymentExceedsBalance,
+                $"Payment total {total} exceeds the invoices' combined balance {totalBalance}.", 400);
+
+        var accounts = await _gl.ListBankAccountsAsync(ct);
+        var lines = request.Lines.Select(l => (
+            Line: l,
+            Account: accounts.FirstOrDefault(a => a.AccountId == l.GlBankAccountId)
+                ?? throw new DomainException(ErrorCodes.SalesInvoiceBankAccountNotFound, $"Bank/cash account {l.GlBankAccountId} was not found.", 404)))
+            .ToList();
+
+        // Oldest invoice first: walk the lines in order, filling each invoice's balance before the next.
+        var ordered = invoices.OrderBy(i => i.InvoiceDate).ThenBy(i => i.SalesInvoiceId).ToList();
+        var allocations = new List<(SalesInvoice Invoice, GlBankAccount Account, decimal Amount)>();
+        var invIdx = 0;
+        var invRemaining = ordered[0].BalanceAmount;
+        foreach (var (line, account) in lines)
+        {
+            var lineRemaining = line.Amount;
+            while (lineRemaining > 0)
+            {
+                var take = Math.Min(lineRemaining, invRemaining);
+                allocations.Add((ordered[invIdx], account, take));
+                lineRemaining -= take;
+                invRemaining -= take;
+                if (invRemaining == 0 && invIdx < ordered.Count - 1)
+                    invRemaining = ordered[++invIdx].BalanceAmount;
+            }
+        }
+
+        var actor = _currentUser.AuditUserId;
+        var now = DateTime.UtcNow;
+        var (paymentDay, paymentDate) = ResolvePaymentDate(request.PaymentDate, now);
+        var paidNos = string.Join(", ", allocations.Select(a => a.Invoice.InvoiceNo).Distinct());
+        var narration = $"Payment against invoices {paidNos}";
+        if (narration.Length > 250) narration = narration[..247] + "...";
+
+        var payments = await _uow.ExecuteInTransactionAsync(async token =>
+        {
+            // One journal for the whole payment (Debit each cash/bank line / Credit AR in total), posted
+            // before anything is committed — so a GL rejection leaves neither GL nor local state half-done.
+            var period = await _gl.GetPeriodByDateAsync(paymentDay, token);
+            var glLines = lines
+                .Select(x => new GlJournalEntryLineRequest(x.Account.GlAccountCode, x.Line.Amount, 0m, narration))
+                .Append(new GlJournalEntryLineRequest(_glAccountsReceivableCode, 0m, total, narration))
+                .ToList();
+            var posted = await _gl.PostJournalEntryAsync(new GlJournalEntryRequest
+            {
+                PeriodId = period.PeriodId,
+                EntryDate = paymentDay,
+                SourceModule = "SALES_INVOICE_PAYMENT",
+                Reference = request.Reference ?? ordered[0].InvoiceNo,
+                Narration = narration,
+                Lines = glLines
+            }, token);
+
+            var entities = new List<SalesInvoicePayment>();
+            foreach (var (invoice, account, amount) in allocations)
+            {
+                var entity = new SalesInvoicePayment
+                {
+                    SalesInvoiceId = invoice.SalesInvoiceId,
+                    Amount = amount,
+                    PaymentDate = paymentDate,
+                    GlBankAccountId = account.AccountId,
+                    BankAccountName = account.AccountName,
+                    Reference = request.Reference,
+                    GlJournalNo = posted.JournalNo,
+                    CreatedBy = actor,
+                    CreatedAt = now
+                };
+                await _payments.AddAsync(entity, token);
+                invoice.PaidAmount += amount;
+                invoice.BalanceAmount -= amount;
+                entities.Add(entity);
+            }
+            return entities;
+        }, ct);
+
+        return payments.Select(Map).ToList();
+    }
+
+    /// <summary>
+    /// The payment's calendar day (also the GL entry date) and the timestamp stored on it. Omitted ⇒
+    /// today. One day of slack on "future": the client sends its local date, which runs ahead of UTC
+    /// for users east of it. Today keeps the actual time of entry; a back-dated payment is stamped at
+    /// that day's start.
+    /// </summary>
+    private static (DateOnly Day, DateTime Stamp) ResolvePaymentDate(DateOnly? requested, DateTime now)
+    {
+        var today = DateOnly.FromDateTime(now);
+        var day = requested ?? today;
+        if (day > today.AddDays(1))
+            throw new DomainException(ErrorCodes.Validation, "Payment date cannot be in the future.", 400);
+        return (day, day >= today ? now : day.ToDateTime(TimeOnly.MinValue, DateTimeKind.Utc));
+    }
+
     public async Task<IReadOnlyList<SalesInvoicePaymentDto>> ListAsync(int salesInvoiceId, CancellationToken ct = default)
     {
         if (!await _invoices.Query().AnyAsync(i => i.SalesInvoiceId == salesInvoiceId, ct))

Backend/ERPCore/Services/SalesPricingService.cs

@@ -21,8 +21,17 @@ public sealed class SalesPricingService : ISalesPricingService
         _fifo = fifo;
     }
 
+    // Sales unit prices are money — always 2dp, whichever source (flat, GRN weighted avg, FIFO avg,
+    // manual) produced them, so the suggested-price endpoint and saved lines agree.
     public async Task<SalesPriceResolution> ResolveAsync(
         int itemId, int warehouseId, decimal? requestedUnitPrice, bool allowManualOverride, CancellationToken ct = default)
+    {
+        var resolved = await ResolveUnroundedAsync(itemId, warehouseId, requestedUnitPrice, allowManualOverride, ct);
+        return resolved with { UnitPrice = Math.Round(resolved.UnitPrice, 2, MidpointRounding.AwayFromZero) };
+    }
+
+    private async Task<SalesPriceResolution> ResolveUnroundedAsync(
+        int itemId, int warehouseId, decimal? requestedUnitPrice, bool allowManualOverride, CancellationToken ct)
     {
         var item = await _items.Query().AsNoTracking().FirstOrDefaultAsync(x => x.ItemId == itemId, ct)
             ?? throw new InvalidOperationException($"Item {itemId} was not found.");

Backend/ERPCore/Services/Stock/StockService.cs

@@ -132,6 +132,18 @@ public sealed class StockService : IStockService
         return PagedResponse<StockOnHandDto>.Create(rows, query.Page, query.PageSize, total);
     }
 
+    /// <summary>
+    /// Same figure as <see cref="GetOnHandAsync"/>'s Available (all layers, negative ones included,
+    /// less held OnHold/Rejected GRN stock), for every item at the warehouse in one grouped query.
+    /// </summary>
+    public async Task<IReadOnlyDictionary<int, decimal>> GetAvailableByItemAsync(int warehouseId, CancellationToken ct = default)
+        => await _layers.Query().AsNoTracking()
+            .Where(l => l.WarehouseId == warehouseId
+                        && !(l.GrnLine != null && (l.GrnLine.HoldStatus == HoldStatus.OnHold || l.GrnLine.HoldStatus == HoldStatus.Rejected)))
+            .GroupBy(l => l.ItemId)
+            .Select(g => new { ItemId = g.Key, Qty = g.Sum(x => x.QtyRemaining) })
+            .ToDictionaryAsync(x => x.ItemId, x => x.Qty, ct);
+
     public async Task<PagedResponse<StockLedgerRowDto>> GetLedgerAsync(
         int? itemId, int? warehouseId, int? branchId, DateOnly? from, DateOnly? to,
         string? sourceDocType, int? sourceDocId, PageQuery query, CancellationToken ct = default)