Change the price of PO in closed for Invoicing status

Summary:

I want to change the price of a PO in closed for Invoicing status.

Content (please ensure you mask any confidential information):

The invoice generation encountered an error during receipt and the invoice was stopped on the interface.
So a debit memo was not automatically generated on return.
This is the reason why the invoice has closed for Invoicing status and the price cannot be changed.

After the return, the import process was manually passed and the receiving invoice was created.
But the debit memo was not created and was manually created and the PO opened.

It is not practical to have the user confirm that the invoice has been created and then have the return process implemented.