PO is not getting created automatically from PR after withdraw and edit process by the requester

A Requester raises a Purchase Requisition at Zero price and no Supplier. It has gone through a Tender Process, a supplier has responded to the the tender and the Line with the item is awarded to that same supplier. The PR requester now goes in to the PR page to do the "Withdraw and Edit" action. Yet after approval the PO is not created automatically. How can I set PO to create automatically.

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