first u have to return the material what ever u send to vendor , go to subcontracting order of that PO and go to Line-->order subcontracting --> in that Delivery details --> filed (Qty .at vendor must be equal to zero , if not equal to zero then try to equal to zero ) after that in that header part u have to close the status ,then after words come back to our PO and changes the status ..it will changes for partially quantity and po also closed in po automatically when u changed status .
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