Thank you for your quick response.
How can I determine which value will cause this exception? Below you can find the complete call stack. BLToolkit.Data.DataException: validation error for column *** unknown ***, value "*** null ***" At procedure 'FEEDINGS_UPDATE' line: 14, col: 3 ---> FirebirdSql.Data.FirebirdClient.FbException: validation error for column *** unknown ***, value "*** null ***" At procedure 'FEEDINGS_UPDATE' line: 14, col: 3 ---> FirebirdSql.Data.Common.IscException: Exception of type 'FirebirdSql.Data.Common.IscException' was thrown. at FirebirdSql.Data.Client.Native.FesDatabase.ParseStatusVector(IntPtr[] statusVector) at FirebirdSql.Data.Client.Native.FesStatement.Execute() at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteCommand(CommandBehavior behavior, Boolean returnsSet) at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteNonQuery() --- End of inner exception stack trace --- at FirebirdSql.Data.FirebirdClient.FbCommand.ExecuteNonQuery() at BLToolkit.Data.DbManager.ExecuteOperation[T](OperationType operationType, Func`1 operation) in C:\Projects\Computronic\SVN\Prowork\Components\bltoolkit.3.1\Source\Data\DbManager.cs:line 4009 --- End of inner exception stack trace --- at BLToolkit.Data.DbManager.OnOperationException(OperationType op, DataException ex) in C:\Projects\Computronic\SVN\Prowork\Components\bltoolkit.3.1\Source\Data\DbManager.cs:line 521 at BLToolkit.Data.DbManager.HandleOperationException(OperationType op, Exception ex) in C:\Projects\Computronic\SVN\Prowork\Components\bltoolkit.3.1\Source\Data\DbManager.cs:line 4031 at BLToolkit.Data.DbManager.ExecuteOperation[T](OperationType operationType, Func`1 operation) in C:\Projects\Computronic\SVN\Prowork\Components\bltoolkit.3.1\Source\Data\DbManager.cs:line 4017 at BLToolkit.Data.DbManager.ExecuteNonQueryInternal() in C:\Projects\Computronic\SVN\Prowork\Components\bltoolkit.3.1\Source\Data\DbManager.cs:line 546 at BLToolkit.Data.DbManager.ExecuteNonQuery() in C:\Projects\Computronic\SVN\Prowork\Components\bltoolkit.3.1\Source\Data\DbManager.cs:line 2370 at Fds.Dal.DataAccess.BLToolkitExtension.FeedingAccessor.Update(Feeding obj) at Fds.Dal.DataAccess.ManagerBase`2.Update(T obj) in D:\svn\FeedingSystem\trunk\Src\Fds.Dal\DataAccess\ManagerBaseT.cs:line 73 at Fds.Dal.DataAccess.ManagerBase`2.Save(T obj) in D:\svn\FeedingSystem\trunk\Src\Fds.Dal\DataAccess\ManagerBaseT.cs:line 92 at Fds.Presenter.ModelPresenter.SetFeedingDto(FeedingDto valueDto) in D:\svn\FeedingSystem\trunk\Src\Fds.Presenter\ModelPresenter.Feeding.cs:line 600
