Clearing "Line 0" in MA236

Our AP staff is entering lines on AP20.4 when they find something on an invoice that does not appear or does not match the PO. These lines show up on the MA236 report as Line 0. The buyers then work the MA236 report and have to let AP know when the line has been manually added to the PO, or if that line matches an existing line on the PO. Then the AP staff has to delete that line and re-enter it. This is how I understand the process so far.

For example: Vendor item # 12345 is ordered on line 1 of a PO. When the invoice comes in, its for vendor item # 12346, which actually was a sub but the buyer didn't update the PO. So, AP enteres a line 0 (because maybe it was an item added to the PO and not actually a sub). To get the line to clear, the buyer has to let AP know to delete the line and rekey it as line 1

Is this the proper way to handle items on invoices that don't exist/match the PO? Is there a screen where the buyers can clear the messages without causing AP to delete and rekey the lines (similar to clearing a buyer message)?

We're looking for a good way to handle the communication between AP and Purchasing and how to improve our process flow and communication.

Thanks in advance for your help.
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