How to know if a PR has been converted to PO in SAP?

The Issue

How to know if a PR has been converted into a PO (list of PR and their status/ which ones need to be processed)

The Solution

If you want to check the PR status, use transaction code ME5A and select processing status B and run the report. Processing Status B indicates that Purchase Order is created for the Purchase Requisition

Source: http://forums.sdn.sap.com/thread.jspa?threadID=1723257&messageID=9262023#9262023