Julie,
The tables have pretty much the same fields, they are part of what are known as marketing documents in SAP B1. Unfortunately, they have relationships that remain puzzling to me, and, apparently many other people. Some records from OINV may not have any relationship to a record in OPCH, but for those that do, I don't have any idea how to map them to each other.
Basically, I need an SAP B1 expert here because I already have 19 years of experience with Crystal Reports. It's the database that's tripping me up, not the reporting software. Thanks.