DFF for auto-populating Supplier Site Hold Flag

Summary: There is a Business requirement to add a DFFs as below:

1. DFF to be auto-populated with the Supplier Inactive date value, for the Supplier which is selected in the Requisition page
2. DFF to be auto-populated with the Supplier Site Purchasing Hold flag, for the Supplier which is selected in the Requisition page

We were able to satisfy the 1st requirement by using table DFF with a Custom value set with FROM clause= POZ_SUPPLIERS and WHERE Clause = POZ_SUPPLIERS.VENDOR_ID = :{PARAMETER.SupplierId}

For the 2nd requirement we are not able to find the corresponding bind variable for Supplier Site ID, which we can use in the value set. So we are not able to create the 2nd DFF.