Item cannot be changed once the document is saved and in this case, the line needs to be deleted and added to a new line with the new item.
Cannot Change Item On an Approved Purchase Order Even If No Reception or Invoice Exists (Doc ID 1335619.1)This is standard functionality, you can not change the item (code) on purchase order even if no receipt, or invoice is created for that PO line. You can change other fields like item description but not item.
workaround: Please cancel the po line with the wrong item, then create a new po line with right item
For this issue exists opened Enhancement Request: Bug:2112017 - ITEM CODE ON AN APPROVED PO CANT BE CHANGED
From 1335619.1 "Please cancel the PO Line with the wrong...."
What is the navigation (menu items or screen) to cancel the item on the saved PO?
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The document says you can not cancel the item you have to cancel the line.
I don't have an idea about R12.2.5 but as per R12.1.3. you go to PO Line using PO SUMMARY form to cancel the PO Line.
After selecting the PO line , navigate to MENU > TOOLS > CONTROL > CANCEL PO LINE
To Cancel the PO line, PO should be Approved.