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Invoice number has already been used

Updated over 3 weeks ago

Check the current highest invoice number

To check what the current highest invoice number is:

  1. Go to enquiries

  2. Type = IN (Invoice)

  3. Sort By - Header Ref

  4. Descending

  5. Search - The top number in header ref field will be the highest Invoice number already used

Correct the invoice number

To correct the invoice number, you can do the following:

  1. Navigate to System, Options, System Options and open the Documents tab

  2. Press the Edit button

  3. Change the Sales Invoice number to greater than the highest number above

  4. Press Save

If you are still getting the error message after checking the above please raise a new case online, reference the title of this article and the order number you are having an issue on.

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