.gitignore

@@ -397,6 +397,10 @@ FodyWeavers.xsd
 *.msm
 *.msp
 
+# Patch files (temporary)
+*.patch
+*.diff
+
 # JetBrains Rider
 *.sln.iml
 /Core/obj/Debug/net8.0/Core.csproj.FileListAbsolute.txt

Models/Interfaces/IExpeditionRepository.cs

@@ -23,6 +23,10 @@ namespace Models.Interfaces
         Task<(int Id, string Expeditionnumber)> CreateFullExpeditionAsync(ELSExpeditionHeader expedition, int formSeriesId);
         Task<ExpeditionDto?> GetDtoByIdAsync(int id);
         Task<PagedResult<ExpeditionDto>> SearchAsync(string? expeditionNumber, string? status, DateTime? issueDateFrom, DateTime? issueDateTo, int? locationId, int page, int pageSize);
+        /// <summary>
+        /// Pasa la expedición a En tránsito y crea las reservas de stock asociadas.
+        /// La operación es transaccional y falla completa si detecta inconsistencias.
+        /// </summary>
         Task MarkInTransitAsync(int expeditionId);
 
     }

Models/Repositories/Stock/PhLSMExpeditionRepository.cs

@@ -406,7 +406,11 @@ namespace Models.Repositories.Stock
         }
         public async Task MarkInTransitAsync(int expeditionId)
         {
+            const byte expeditionReservationSourceType = 1;
+            const int reservedStatus = 1;
+
             var header = await _context.PhLsmExpeditionHeaders
+                .Include(x => x.PhLsmExpeditionDetails)
                 .FirstOrDefaultAsync(x => x.Id == expeditionId);
 
             if (header == null)
@@ -415,11 +419,150 @@ namespace Models.Repositories.Stock
             if (header.Status != (int)ExpeditionStatus.Emitida)
                 throw new InvalidOperationException("Solo las expediciones en estado 'Emitida' pueden pasar a 'En tránsito'.");
 
+            var details = header.PhLsmExpeditionDetails?.ToList() ?? new List<PhLsmExpeditionDetail>();
+
+            if (details.Count == 0)
+                throw new InvalidOperationException("No se puede pasar la expedición a 'En tránsito' porque no tiene ítems para reservar.");
+
+            var invalidStockItems = details
+                .Where(d => d.StockitemId <= 0)
+                .Select(d => d.Id)
+                .OrderBy(x => x)
+                .ToList();
+            if (invalidStockItems.Count > 0)
+            {
+                throw new InvalidOperationException(
+                    "No se puede pasar la expedición a 'En tránsito' porque existen detalles sin stockitem_id válido. " +
+                    $"Detalle(s): {string.Join(", ", invalidStockItems)}");
+            }
+
+            var duplicateStockItems = details
+                .GroupBy(d => d.StockitemId)
+                .Where(g => g.Count() > 1)
+                .Select(g => g.Key)
+                .OrderBy(x => x)
+                .ToList();
+
+            if (duplicateStockItems.Count > 0)
+            {
+                throw new InvalidOperationException(
+                    "No se puede pasar la expedición a 'En tránsito' porque el mismo StockItem aparece más de una vez en la expedición: " +
+                    string.Join(", ", duplicateStockItems));
+            }
+
+            var detailByStockItem = details
+                .Select(d => new
+                {
+                    DetailId = d.Id,
+                    StockitemId = d.StockitemId,
+                    Quantity = d.Quantity
+                })
+                .ToList();
+
+            var stockItemIds = detailByStockItem
+                .Select(x => x.StockitemId)
+                .Distinct()
+                .ToList();
+
+            var duplicatedReservations = await _context.PhLsmStockReservations
+                .AsNoTracking()
+                .Where(r =>
+                    r.SourceType == expeditionReservationSourceType &&
+                    r.SourceId == expeditionId &&
+                    r.Status == reservedStatus &&
+                    stockItemIds.Contains(r.StockitemId))
+                .Select(r => r.StockitemId)
+                .Distinct()
+                .OrderBy(x => x)
+                .ToListAsync();
+
+            if (duplicatedReservations.Count > 0)
+            {
+                throw new InvalidOperationException(
+                    "La expedición ya posee reservas activas para los siguientes StockItem: " +
+                    string.Join(", ", duplicatedReservations));
+            }
+
+            var stockItems = await _context.PhLsmStockItems
+                .Where(x => stockItemIds.Contains(x.Id))
+                .ToListAsync();
+
+            var stockItemsById = stockItems.ToDictionary(x => x.Id);
+
+            var missingStockItems = stockItemIds
+                .Where(id => !stockItemsById.ContainsKey(id))
+                .OrderBy(x => x)
+                .ToList();
+
+            if (missingStockItems.Count > 0)
+            {
+                throw new InvalidOperationException(
+                    "No se puede pasar la expedición a 'En tránsito' porque algunos StockItem no existen: " +
+                    string.Join(", ", missingStockItems));
+            }
+
+            var insufficientAvailability = new List<string>();
+
+            foreach (var item in detailByStockItem.OrderBy(x => x.StockitemId))
+            {
+                var stockItem = stockItemsById[item.StockitemId];
+                var availableQuantity = stockItem.Quantity - stockItem.ReservedQuantity;
+
+                if (item.Quantity > availableQuantity)
+                {
+                    insufficientAvailability.Add(
+                        $"• StockItem {item.StockitemId} → solicitado: {item.Quantity}, disponible: {availableQuantity}.");
+                }
+            }
+
+            if (insufficientAvailability.Count > 0)
+            {
+                var lines = new List<string>
+                {
+                    "No se puede pasar la expedición a 'En tránsito' porque algunos StockItem no tienen cantidad disponible suficiente para reservar."
+                };
+
+                lines.AddRange(insufficientAvailability);
+
+                throw new InvalidOperationException(string.Join(Environment.NewLine, lines));
+            }
+
+            using var tx = await _context.Database.BeginTransactionAsync();
+
+            try
+            {
+                var now = DateTime.Now;
+
+                var reservations = detailByStockItem.Select(item => new PhLsmStockReservation
+                {
+                    SourceType = expeditionReservationSourceType,
+                    SourceId = expeditionId,
+                    StockitemId = item.StockitemId,
+                    ReservedQuantity = item.Quantity,
+                    Status = reservedStatus,
+                    Createdat = now
+                }).ToList();
+
+                _context.PhLsmStockReservations.AddRange(reservations);
+
+                foreach (var item in detailByStockItem)
+                {
+                    var stockItem = stockItemsById[item.StockitemId];
+                    stockItem.ReservedQuantity += item.Quantity;
+                    stockItem.Modifiedat = now;
+                }
+
                 header.Status = (int)ExpeditionStatus.EnTransito;
-            header.Modifiedat = DateTime.Now;
+                header.Modifiedat = now;
 
                 await _context.SaveChangesAsync();
+                await tx.CommitAsync();
+            }
+            catch
+            {
+                await tx.RollbackAsync();
+                throw;
+            }
         }
     }
-
 }

Models/Repositories/Stock/PhLSMStockReservationRepository.cs

@@ -1,7 +0,0 @@
-
-namespace Models.Repositories.Stock
-{
-    internal class PhLSMStockReservationRepository
-    {
-    }
-}