Possible problem with model store.

I am having a problem with deleting elements in my usr layer.

As an example i have a class names PCImportAttributeDefaultValueHandler, it exists in syp and usr, though if i do a compare there are no differences.

Not if i try to delete the class, i get this error.

Error Message (14:35:01) Cannot execute a stored procedure.
The SQL database has issued an error.
Info Message (14:35:01) SQL error description: [Microsoft][SQL Server Native Client 11.0][SQL Server]The INSERT statement conflicted with the FOREIGN KEY constraint "FK_ModelElementData_HasModelId_LayerId". The conflict occurred in database "Axapta60_0R3_model", table "dbo.Model".
Info Message (14:35:01) SQL statement: { CALL [Axapta60_0R3_model].[dbo].[XU_Insert](?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) }

Any idea what is wrong?