Which Bill to address Oracle Dunning letter program select & print?

Dear AR Team,

How do I determine as what AR Customer Bill-To address our monthly Oracle Dunning Letter select and prints on the DL?

We do NOT have our Dunning Address purpose code setup for our customers.

We do have primary address flag set for our customers. We have customers with several different Bill to addresses.

Based on my review of some of our printed Dunning Letters I have seen most of our AR customer Transaction bill-to address match with bill to addresses that are printed

on our printed Dunning Letter. However, these Bill-to addresses are not defined with primary site address flag.