Problem
You have received a PO and need to unsend it.
Solution
Your PO will be unsent and its status will be changed back to pending.
Unsend a received PO
Go to the PO that you need to unsend.
Click on the documents under the PO. You will see both the Receipt and the Bill.
For each document (Receipt and Bill), click Actions.
Select Cancel for both the Receipt and the Bill.
After canceling both documents, go back to the main page of the PO.
Click Actions and select Return to Pending.