Message SAP /ISDFPS/MM_CS032 - No GRs have been posted for PO &1; system switch is not permitted

Diagnosis
No goods receipts have been posted for purchase order (PO) &V1&. ThePO is therefore still open and cannot be archived.

System Response
The system cannot close PO &V1& automatically.

Procedure
Post the goods receipt for PO &V1&before you switch systems.