can this be done via standard suiteflow or will need scripting?: if an approved PO is edited and the amount is increased, the PO should be for re-approval. But if the amount is decreased, the PO is still approved upon saving.

@blue I would use a Workflow field that captures the Tran Total on entry. Then Before Submit compare and action on the original value with the tran value to be saved.

I'll experiment on that parameter thanks!