Approval workflow for adding approved requisition to existing PO

Summary:

All requisitions go through an approval process, so we don’t want to duplicate approvals when we add an approved requisition to an existing PO. The goal is the following:

• Bypass change order approval if all lines added to the existing PO are from an approved requisitions (Note: We use the price change tolerance to prevent changes on the requisition amount when processing into a PO)
• Trigger approval if any line added on a change order does not have a backing requisition
• Trigger approval if an existing line is modified on a change order

I have tried the following conditions: