Duplicate Document Number Error : You must specify a different number. This number has already been used.

QuickBooks Online > Intuit App Center - Transaction Pro Importer for QuickBooks Online
If you receive the following error:  Duplicate Document Number Error : You must specify a different number. This number has already been used, this is because a transaction already exists in QuickBooks with this number.

If you want to allow QuickBooks Online to use duplicate numbers make the following changes in QuickBooks Online:

For sales transactions:  Under the gear/Company Settings/Sales - turn OFF custom transaction numbers.

For bill and check transactions:  Under the gear/Company Settings/Advanced and under Miscellaneous turn off Warn if duplicate option.

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