SAP Message AC659 - You cannot change, create or delete SAP line item schema &1

Diagnosis You want to change, delete or create line item schema &v1& again.However, line item schema &v1& is an SAP standard line item schema.Therefore, you cannot change it, delete it or create it again. An SAP standard line item schema starts with 'S'. System Response The action is not carried out. Procedure You can use SAP line item schema &v1& only as a reference for copying.