I'm new to Baan and looking to help one of our partner companies introduce some BI functionality and need some help in finding out what the Baan Invoice and Lines tables are called and if possible a layout of each. Any help in this would be greatly appreciated.

Well - if nothing else complete your profile. I am sure the various versions probably use different tables. The layout of the tables should be retrieved from the actual tables - since those to can vary from version to version.