Advance Billing Invoice Shows Backorder Qty (Vantage 8.03)

Hi All,

When we advance bill a customer the invoice has the correct $ amount but it shows a backorder qty. This is a recent development so I'm thinking someone changed the process used to create and link Orders/Jobs/Packing Lists/Invoices. Also, when we invoice a second pogress payment on these same orders by shipping a fractional quantity the OrderRls.OurJobShppedQty stays at zero. This is causing huge headaches (mostly for me) and I need to know where to look for the solution. I've looked at the part maintenance form, sales order entry form, customer shipment entry form and the job entry form but there's nothing obvious to me and there's so much data I don't really know how to narrow down my search.

Any ideas? Thanks in advance.

Rick