How do I void something that hasn't already voided because it has the same EFT #

Hello, I enter an EFT but instead of posting 33K I only posted 30K I voided the EFT #123 transaction and went to report for the full 33K but instead I posted to the wrong bank account, when I went to void EFT #123 for the second time it tells me this transaction has already been voided. But it was voided for the 30K not the 33K now I can't figure out how to fix this so I can post the correct amount to the correct bank account.