How to fix incorrect payment to a credit memo

Hi,

We are in R12.2.11 and we ran into a payment issue to one Credit Memo. First, before payment the Credit Memo's invoice lines were manually adjusted. Then when it was paid, we noticed the payment amount is incorrect, it was a partial payment. In reviewing the credit memo invoice, we found under the Scheduled Payment Tab, the Gross Amount incorrect. It appears when the Credit Memo's invoice lines were manually adjusted, the scheduled payment amounts were not adjusted.

1. Could the incorrect scheduled payment amount led to the incorrect payment or partial payment to the Credit Memo?
2. How do we correct the payment to this Credit Memo?