Unable to change the Requestor on a Req Created from E-pro

Hello All ,

We have a Situation where the user is trying to change the Requestor on a Requisition which is already sourced to a PO.

• 1 ) These are the Requisition which are created in E-pro.
• 2 ) user tries to go the Menu Path : Main Menu==> Purchasing==> Requisitions==> Add/Update Requisitions.
• 3 ) Initially when the Requisition screen Opens up , The requestor Field is Read Only.
• 4) User Clicks the Triangle Button on the Right Side of the Screen next to the Status, to create a Header Change .
• 5 ) This will enable the Requestor Field for Editing. User Can the Requestor and when he is trying to save the Requisition , he is getting a Error Message : " Data Being added conflicts with the Existing Data.