It's very useful document, if you want to Reset a Purchase Order or Requisition From In Process or Pre-Approved To
Incomplete/Requires Reapproval For Isolated Cases.
Please go through the attached document and download the patch in support.oracle.com
Before going to use the script on production instance, please use the script in test instance.
How to reset a purchase order or requisition from in process or pre-approved to incomplete/requires 2015-06-30
How to reset a purchase order or requisition from in process or pre-approved to incomplete/requires