How can we correct a prepayment that was reference an incorrect line of the PO?

Summary:

4 Prepayments were created for the 4 lines of the PO. Prepayment 1 and 4 referred to the correct PO lines (1 and 4) while Prepayment 2 and 3 referred to PO line 1 which was applied already with invoice 1. When now try to apply prepayment for inv 2 and 3 the PO details are not available. All 4 Prepayments are paid. How can we proceed?

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22C

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