How to Handle PO Price update on the PO whose receipt is already done

Summary:

Retroactive Po Pricing is updating all the PO price however we are looking for update of specific PO Price

Exa;

BPA has line-1 Item A with Price 10 and expired date is 30th May, Line-2Item A with Price 20 and expired date 30th june.

We have performed the receipt of the PO.

Requirement to update PO Price for line-2, Item A as 50$.

Please suggest solution for the same

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