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Duplicate Document Number Error

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If you receive the publishing error "Duplicate Document Number Error: You must specify a different number. This number has already been used." this means that the invoice number already exists in your QBO account.

You can easily fix it by following these steps:

 1.Open your QBO and navigate to Settings >> Account and Settings >> Sales

 2.Check that 'Custom transaction numbers' is turned OFF

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 3.Back to QBO Settings >> Account and Settings >> Advanced

 4.Check that 'Warn if duplicate check/bill number is used' is also turned OFF

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