Inventory write -off account needs to nullify

Hi Team,
We have PO and user received the PO.
We didnt had AP invoice.
We had a sales order for that quantity and shipped the PO receipt quantity.
We did the costing so we had the entrie5.
After few days, we had a AP invoice for above PO with invoice price higher than the PO price. then we did accounting again and ran cost to cost paybles and all costing jobs. so now at cost accounting level we had inventory write off account with debit balance.
When we can contra entry to it?
Or we should pass a Manual JV for inventory write off?