Invoice matching: This is nothing but matching invoices w.r.t purchase orders. Purchase orders contain three types of matching options.
1. Two way matching
2. Three way matching
3. Three way matching.
Observe po_line_locations_all Table, we contain two columns called inspection_required and Receipt needed. If both are flagged 'Y' then invoice is 4 way matches to PO that means, whereas creating receipt manual inspection of goods is needed. In other words we have to enter quantity manually in receipts and creation of receipt is obligatory in this procedure. In 3 ways Match Approval Option receipt needed is Y and Inspection needed is N Here inspection of goods received is not obligatory. In two ways Match approval both flags are 'N' in this case receipt creation is not essential to pay for the purchase order.