Purchase Order AWE and changing arrival date causing approval workflow to restart

Using FSMC 9.2. PeopleTools 8.57. There was a PurchaseOrder process id that was delivered or came out of the box.

I modified that PurchaseOrder process slightly...

What is happening...when a purchase order is submitted, then approved... But, then something needs to be modified...like the Arrival Date. Then, the PO is resubmitted or starts approval workflow again.

1) it makes sense that if the value changed (the lines, the quantities, etc) then it needs to get re-approved...but why does changing the arrival date restart the approval process? Is there a way to configure it so that changing arrival date doesn't restart the approval process?