A/P Voucher has been unmatched, but most purchase receipts cannot be re-matched in new PV

The user created PV 14900076, and matched it to 280 purchase receipts from four purchase orders.

 

However, a mistake was realized during the PV creation. It was decided to reverse all matched receipts (GRNs) and re-match them under a new PV.

 

However, after reversing the matches, any attempt to re-match the Purchase receipts only displays 2 of the 280 reversed items (shown in yellow in the attached document "3- PV 14900076 F43121 related OVs and reversed PVs.xlsx). The remaining 278 cannot be revouchered.

 

On closer inspection, I realize that in these 2 exceptions, the fields F43121.PRUOPN (units open) and F43121.PRAOPN (amount open) have values greater than zero (20,862.00 and 25,356.48 respectively).