VMA Automation Rule 03 - Invoice and PO Lines Have to Match

We are testing VMA for a POC project. We are using Automation Rule 03 and are finding getting 'Match Not Found' exceptions on the match report unless the PO Line Numbers entered on the EDI Batch Voucher pay items exactly match the PO Detail Line Nbrs for each respective item being invoiced. The supplier master is set up to require Order Information but not Item Information. I cannot find a clear explanation in the online JD Edwards EnterpriseOne Applications Procurement Management Implementation Guide whether the Invoice and PO Line Numbers have to match each other, and if so, under what conditions.