When transmitting data to QuickBooks, you may receive the following error - 400 : ValidationException was thrown. BadRequest - 6140: Duplicate Document Number Error [: Duplicate Document Number Error : You must specify a different number. This number has already been used.] This occurs in two situations.
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To fix AR transactions, turn OFF Custom transaction numbers. This is available from Gear Icon | Company Settings | Sales. So what are Custom transaction numbers? QuickBooks lists this as "Lets you use your own numbering system. If left blank, invoice numbers are automatically assigned by QuickBooks." |
To fix AP transactions, turn OFF Warn if duplicate bill number is used. This is available from Gear Icon | Company Settings | Advanced. |