Two transactions have been assigned the same Nominal Journal number
MYOB Accounting Plus allows you to assign the same Nominal Journal number to multiple transactions.
If you didn't intend to assign a duplicate Nominal Journal number to the second journal entry and you wish to change it, locate the journal entry in the Transaction Journal window and click the zoom arrow. The transaction will appear in the Record Journal Entry window as you originally entered it. Depending upon how your preferences have been set, you can either edit the Nominal Journal number or reverse the transaction and reenter it with the correct Nominal Journal number. (Choosing changeable or unchangeable transactions)