You need to get a better practice in place so that you do not accumulate 800 of these again. At this point, if you close the PO, the item comes off the RNI list but amounts are not moved from the GL. For 800 I would suggest closing all dead POs, run the RNI report and get a total, and JE the RNI GL account. This is not proper accounting, I know, but with good notes on the transactions, auditors will accept the transactions if they are to the correct accounts.
If you have entries on the RNI report after closing all POs and they have been paid through un-matched invoices, you can delete them through SQL from the RNI table. Then reconcile, run the report again, and GL Adjust.
