Message SAP WS616 - No message determination schema for item messages in billing doc. type &1

Diagnosis You want to IF &V3& = 'X'. edit ELSE. issue a message for document &V2&. ENDIF. However, no message determination schema is entered in billing documenttype &V1&. System Response The system cannot perform the requested transaction. Procedure Include a message determination schema in the billing document type. INCLUDE 'NA_CUST_MAINTAIN' OBJECT DOKU ID TX IF &DEVICE&='SCREEN' Maintain billing documents ENDIF.