SAP Message 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.