How to correct an invoice created and paid to an incorrect PO line?

Summary:

We have a Purchase order with 2 lines and for different charge accounts. Line 1 - 250k; Line 2 - 30k. A receipt and invoice amounting to 100k have been created against line 1 which also has been paid. But later on, client realized that the payment of 100k for line 1 should have be made for both lines as follows:

Line 1 - 80k

Line 2 for 20k

How to correct the invoice reflecting the correct amounts?

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