How to move payment from one customer to another when bank got reconclied

hello,

The situation is, I need to move wrongly posted payment from customer A to customer B after the bank has been reconciled. The system does not allow me to do “Cancel Payment” or “Reverse Transaction” since Bank Reconciliation was Completed.

I am plan to enter a negative $ amount under customer A and post another $ amount customer B, which the system force me to choose Bank Account or Ledger GL account.

Would you please advise if any better process not touch GL or Bank?

Thank you so much!!