Reapproval of Purchase Order not following Change Templates

Hello,

We have change templates set up for the records/fields relating to purchase orders listed below. Majority of the fields we are tracking changes. The only fields we are requiring reapproval when a change occurs is in the PO_LINE_SHIP record; the fields MERCHANDISE_AMT, PRICE_PO, and QTY_PO.

We had a two different situations where changes were made to POs that were not the MERCHANDISE_AMT, PRICE_PO, and QTY_PO. The exact instances I am referring to are:

1. Accounting information was updated on Line 2 on a purchase order. This prompted reapproval for an already approved PO. Do you know the reason this PO was required to gain approval when it was already previously approved and the only information that was updated was the accounting information. The MERCHANDISE_AMT, PRICE_PO, and QTY_PO fields were NOT altered.