Whenever you make a change to a document that causes its status to change to Requires Reapproval, that document is routed through the change order workflow. The Change Order workflow uses the same reapproval rules already defined in Purchasing.

With the change order workflow, Purchasing lets you define what changes to purchase orders or releases-for example, to amounts, suppliers, or dates-require manual reapproval and which are automatically reapproved. If you modify the change order workflow then you can allow certain changes to bypass full (manual) reapproval. All reapproved documents, either fully or automatically reapproved, result in the document revision number's being incremented.

All of the workflow processes and functions relating to change orders can be found within the PO Approval workflow.
The change order workflow begins when all of the following is true:

1. Changes to a purchase order cause its Status to change to 'Requires Reapproval.'
2. The document revision number of the purchase order increases.
3. You select Submit for Approval (and then choose OK) in the Approve.