Duplicate Document Number

The document number is a reference number for your transaction.

Document numbers should be unique. If you do not specify the document number then a unique number will be auto-generated by QuickBooks Online.

If you specify the same document number for different transactions, then you may encounter this business validation erorr:

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

To fix this, simply give your transactions different document numbers.

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