Hi SChis,
Yes, if you created a new invoice document, then this 'uses' an invoice number, even if you later on change the document type to be a credit note. It has to be this way, because the document number is determined on creation, not when saving or posting.
The way to prevent this scenario is to select Credit Note as the document type on the 'new invoice' screen when selecting the customer. Once you are in the invoice and editing it, it is too late for the number.
If you want to see a list of 'missing' document numbers and reasons, there is a report called the 'Deleted invoice audit list' on the Reports menu, which tracks invoice numbers that were 'used' but not posted.
And to answer your question, yes you can override the invoice number on the Totals tab to use 1239. But then the invoice number that was previously generated will now be a 'missing invoice' for the same reason. You can reset the Next invoice number to use in the company profile.
Edited by Softrak Support (09/26/12 11:51 AM)
Edit Reason: more information
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Softrak Tech Support