Unable to default Acknowledgement from BPA to PO

Summary:

We have a client requirement regarding PO aknowledgment from supplier portal. They create lot of catalogs(BPA)to allow automated PO creation once the requisition is approved. They have these BPA enabled for supplier acknowledgement(document level)but when the PO gets automatically created the acknowledge settings from BPA doesn't get defaulted in the PO(On BPA the acknowledgement is document , whereas the automatic PO created has acknowledgement as None). As these PO are automatically created so currently buyer has to manually create change order to add aknowledgement settnig in PO and then only the supplier can acknowledge from supplier portal.