Any and all changes to PO's equal to and over $25,000 will require workflow approval. For example, email addresses and fax numbers for PO distribution, payment terms, ship-to addresses, final destination codes, etc. This is a work in progress until Jaggaer is able to provide a change request that identifies only amount change.
Also, we recently discovered a change in look when using the Finalize Revision feature after updating a PO. If you do not want to have the PO sent to the supplier when finalizing revisions, please do not check the box next to Distribute PO. The PO will export to BFS regardless upon clicking the Save button when finalizing the revision.