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One of procurement audit finding is, PO release has to be reset whether PO value increase or decrease. Old fashion way, PO release only reset if total value is increase only. Testing and googling shows that there is no way PO release reset if total value is decrease. So we choose freeze PO on its fully release state.
SPRO > IMG > Materials Mangement > Purchasing > Purchase Order > Release Procedure for Purchase Orders > Define Release Procedure for Purchase Orders > Release Indicator

But then problem occur. If user want to edit the PO, it has to be un-released first. And still PO cant be un-released if PO has been issued (error is ‘Document has already been outputted… ’). We still waiting the solution from SAP. Or we need to create new different procurement procedure for this. Or, another solution is using user-exit.