Gun sonu alirken "Sequence contains more than one matching element" hatasi

Log dosyamda asagidaki gibidir,

[Exception Info 1]

Top-level Exception
Type:        System.InvalidOperationException
Message:     Sequence contains more than one matching element
Source:      System.Core
Stack Trace: at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
   at Samba.Domain.Models.Inventory.WarehouseConsumption.UpdateFinalCost(Recipe recipe)
   at System.Collections.Generic.List`1.ForEach(Action`1 action)
   at Samba.Domain.Models.Inventory.WarehouseConsumption.UpdateFinalCost(IEnumerable`1 recipes)
   at Samba.Domain.Models.Inventory.PeriodicConsumption.UpdateFinalCost(IList`1 recipes, Int32 warehouseId)
   at Samba.Presentation.Services.Implementations.InventoryModule.InventoryService.CalculateCost(PeriodicConsumption pc, WorkPeriod workPeriod)
   at Samba.Presentation.Services.Implementations.InventoryModule.InventoryService.CreateNewPeriodicConsumption(Boolean filter)
   at Samba.Presentation.Services.Implementations.InventoryModule.InventoryService.GetCurrentPeriodicConsumption()
   at Samba.Presentation.Services.Implementations.InventoryModule.InventoryService.DoWorkPeriodEnd()
   at Samba.Presentation.Services.Implementations.InventoryModule.InventoryWorkperiodProcessor.ProcessWorkPeriodEnd(WorkPeriod workPeriod)
   at Samba.Presentation.Services.Implementations.WorkPeriodModule.WorkPeriodService.StopWorkPeriod(String description)

-----------------------------

[Assembly Info]

PresentationFramework, Version=4.0.0.0
System.Xaml, Version=4.0.0.0
Microsoft.Practices.Prism.MefExtensions, Version=4.0.0.0
mscorlib, Version=4.0.0.0
System, Version=4.0.0.0
WindowsBase, Version=4.0.0.0
Samba.Services, Version=1.0.0.0
Samba.Presentation.Services, Version=1.0.0.0
Samba.Domain, Version=1.0.0.0
PresentationCore, Version=4.0.0.0
Microsoft.Practices.ServiceLocation, Version=1.0.0.0
Samba.Infrastructure, Version=1.0.0.0
Microsoft.Practices.Prism, Version=4.0.0.0
Samba.Presentation.Common, Version=1.0.0.0
System.ComponentModel.Composition, Version=4.0.0.0
Samba.Localization, Version=1.0.0.0

Sorunu daha onceki cevaplari inceleyerek cozdum. Recetede olan bi urunun ismi degistirilmis, gun sonu yaparken stoktan o urunu dusmek istiyor sistem fakat isim degisikligi oldugu icin o urunu bulamiyoru sanirim. Ben sorunu ilgili receteleri silerek halletim, ayni sorunu yasayacak arkadaslarin bilgisine..

Çözümü bulmuş olmanız çok güzel.

Kolay gelsin, iyi çalışmalar....