MYOB AccountEdge allows you to assign the same invoice number to multiple sales transactions. Depending upon how your preferences have been set, a message may appear to alert you when you record the transaction, and you'll be given the option to cancel recording and enter a new number. (If this message wasn't displayed and you'd like it to be in the future, open the Preferences window, choose the Sales view and mark the "Warn for Duplicate Invoice Numbers on Recorded Invoices" option.)
If you didn't intend to assign a duplicate invoice number to the second sale and you wish to change it, locate the sale in the Sales Register window or the Transaction Journal window and click the zoom arrow. The transaction will appear in the Sales window as you originally entered it. Depending upon how your preferences have been set, you can either edit the invoice number or reverse the transaction and reenter it with the correct invoice number. (For more information, see What are changeable and unchangeable transactions?)
This tip applies to:
Sales window -- all layouts