How to remove FOB from PO

There is a business requirement to remove FOB from PO. In the PO, FOB is defaulted from Blanket agreement as well as Supplier site.

In case of supplier site, I will manually remove the FOB so no defaulting happens.

However in blanket agreement, if I remove FOB, it is going into approval.

Is it possible to stop the defaulting of FOB into new POs without changing blanket agreement as business cannot afford to manage so many approvals.

Is there a way to stop defaulting of FOB from blanket agreement into PO even if PO is created from the agreement?

Regards,