How To Fix V4013 - The PO numbers in the sched. agreement differ from the ones selected

SAP Error Message - Details

• Message type: E = Error

• Message class: V4 - Nachrichten Verkauf (Variable Meldungen und EDI-Meldungen)

• Message number: 013

• Message text: The PO numbers in the sched. agreement differ from the ones selected

What causes this issue?

The purchase order number which you have entered in the selection
screen is not available in the scheduling agreement header, or as an
item in the scheduling agreement.

System Response

The system rejects your choice or issues a warning message.

How to fix this error?

Check which scheduling agreement item(s) you want to edit, to avoid
processing the wrong item(s).

Error message extract from SAP system. Copyright SAP SE.