PO change approval on Project Number

Summary:

Our current logic of PO Change Order approval only looks at change in amount.
Any increase in PO Amount should trigger approval, no change in amount or decrease is auto approved. However, if Project Manager in line level is changed, and no amount change is made it needs to route to the new Project Manager for approval. What is the correct attribute to use to find any changes in POET details? How will it route to the new Project Manager?

Any feedback is much appreciated.

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