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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.