A Purchase Order return can be generated in X3 against an already received Purchase Order. This can be achieved from the Return management screen in the Purchasing Module (Purchasing->Return->return management.
A purchase receipt that has been created will be available for selection in the left browser if a correct corresponding Site/Supplier combination is entered in the Transaction screen. You can select multiple receipts against the same Site/ Supplier Combination.
Then change the status field of the Product lines to “R” (R status means that the line has been rejected and this line can be used to issue out the rejected inventory)
Click on the create button to Complete the process of Creating a Return Purchase Order.