How to save Purchase Return if following error ‘The Acceptance Criteria is not matching from the header ‘ occurs on finish?

Cause: System will not allow to finish Purchase return if the acceptance criteria selected is not matching with the Purchase order acceptance criteria.
System shows the ‘The Acceptance Criteria is not matching from the header’ or ‘Invalid PO ‘ error.
Remedies:
1) User needs to ensure that Accept Criteria is not blank. This field is under commercial group in header screen of Purchase return.
2) User should ensure that the same value is selected in accept criteria which is saved in Purchase order.