We have quite a few Purchase Orders that will have multiple receipts.

We assign purchase order charges in the form of freight and fuel surcharges.

Our issue is the PO may come in over several receipts.  The fuel surcharges may change by the time the final receipts are registered.

However, if you update the charge price, it updates any receipts that have not been matched and closed.

Is there a way to schedule purchase order charge changes so they do not update previous receipts.

I.E

Receipt 10/30 - Surcharge was 10%

Receipt 11/10 - Surcharge was 11%.

If receipt from 10/30 is still open and we update the surcharge to 11%, it updates the 10/30 receipt to 11% also.