How to setup a DFF to be cleared every time a new PO Change order is created?

Summary:

We have a DFF fields for a change order in the PO Header, we need to enter that DFF values every time that a PO change order is created, the problem is when enter more than one change order because that the values entered in the DFF remains, hence, the users could not update properly the DFF because it already has values.

We need a way to setup the DFF fields to be cleared for each change order creation.

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