When a purchase order is created, then a change has to be made to the po, there should be a revision number added to or included on the purchase order. This was suggested to us by a quality auditor.
This feature is already available for a PO Line, i think it is at the bottom of the PO by Line, Revision Field next to Vendor REference....
This already exists, in the po line item under details there is a revision box. If you add something there the po will say "Revised" and that line number will be revised
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