Deletion of Attribute SAP ID after creation of a task/function definition copy

After initial load a SAP ID is being added in the attributes of each synchronized object in the transfomation database. Later his ID will be written into to object attributes in the Development database.
When creating a definition copy in ARIS the SAP ID is being copied as well into the attributes of the definition copy. Synchronizing then results in an error because the SAP ID is already existing.