I figured it out. We are on version 10.0 with our upgrade planned to 2013 at the end of the year. The issue is that if the original document in the Master Number string is a Quote, and that quote is transferred to an order and on to an invoice, the invoice due date appears to select the actual ship date as the due date. Most of the time, for us, it is the same day, but we have many instances in which it is previous to the invoice date. That made it pretty difficult to figure out, but I found it by comparing address id (our job information) on all invoices that had the early date problem. I know we will not get a fix for this in the software, so we are determining a business process way to solve the problem. Thanks for walking through this with me.
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