When Supplier has created one debit memo to increase there AP Liability in that time liability is go

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The PO was created 3 months ago and applied to the standard invoice. The PO has been closed, and the AP period has also been closed. Now, Customer and the supplier have an agreement that the prices will be adjusted retrospectively to account for inflation. When Supplier has created one debit memo to increase there AP Liability in that time liability is going to decrease not increase.

If both supplier and customer are using Oracle fusion and the customer has used a debit memo on the AR side how the supplier will record it in the AP side?