Original Doc is not reopening

Hello All,

We are using SAP 9.1,

Scenario - After adding Goods Return, original document PO qty remains same. (system is not reopening the original Doc).

We are getting the msg - You want to reopen original document. After selecting YES also qty remains same in the PO.

Qty in warehouse changes correctly.

Note - Reopen Doc. by Creating returns/Goods returns.Credit Memos Based Doc. this setting in PO document setting is ticked.

Regards,

Hitul