Hi kirsten29 - If you are trying to change the account on an invoice that has already been paid and the payment has cleared the bank, there are 2 possible methods:

- You can void the payment which then reopens the invoice; then correct the invoice, repay, then go to the payment in the journal and change the status to Cleared

or

- You can enter a journal transaction in 1-3 that moves the amount from the incorrect GL account to the correct one