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QuickBooks Online: Duplicate Document Number Error - Connect IT Community | Kaseya
<main> <article class="userContent"> <p><span data-contrast="auto"><strong>Problem</strong></span></p> <p>Duplicate Document Number Error: You must specify a different number. This number has already been used. </p> <p><span data-contrast="auto"><strong>Resolution</strong></span></p> <p>Invoice numbers in QuickBooks have to be unique, make sure that there is no other invoice in QuickBooks that already has the same invoice number which you are trying to export from BMS. </p> </article> </main>