Missing Lines When Matching Invoices to Receipts? in Microsoft Dynamics GP

Partial receipts against POs are a normal part of business and vendors will send invoices to match the items already delivered. If this process is miss-managed, it can become difficult to match invoices to receipts.  One purchasing manager very carefully edited his open POs after partial receipts were recorded. He did not want the POs to show items on order that were already delivered. When the accounting department went to match the invoices to the receipts, some lines could not be found!  Dynamics GP carefully manages received quantities against existing PO documents. It is NOT necessary to edit the PO once some lines have been received. Deleting lines already received will so confuse the system that invoices cannot be matched. This can result in amounts being left in Receiving Accruals and double posting of expenses.  Generally speaking, if a line has been properly received on a PO, the system will mark the lines received and they will not show on any expected receiving report.