Amount Billed on PO Line Locations table shows $0 while corresponding record on PO Distributions sho

 Hi.  This may be a very basic question but after running a diagnostic script in AP for a particular invoice that is on hold for failing encumbrance accounting, we see that the ap_po_line_sync_sel.sql script tells us that the amount billed on the po shipments table doesn't equal the amount billed on the po distributions table.  My question is, are those values supposed to be the same?  And, is that a new condition in R12.1.3 by chance?  We upgraded recently (May 2012) from 11.5.10.2 and if I run the SQL statement from the diagnostic without referencing a specific invoice_id, it would seem