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      Quickbooks : Quickbooks Desktop Error : Duplicate Document Number

      Article Contents: This article summarizes how to resolve the Quickbooks sync error, "Duplicate Document Number."

      Step by Step

      Step 1: Open your QuickBooks Online and navigate to Settings > Account and Settings > Sales.

      Step 2: Check the 'Custom transaction numbers' setting. It needs to be turned OFF.
       

      Step 3: Click back over on the left menu panel to QuickBooks Online Settings > Account and Settings > Advanced.

      Step 4: Check 'Warn if duplicate check/bill number is used' setting. It should also be turned OFF. Make adjustments as mentioned and then retry syncing.