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QuickBooks for Windows Sync Error: You must specify a different number.

Error

You must specify a different number. This number has already been used.

Explanation

This error occurs when Quickbooks preferences are set to prevent the invoice number of the bill or reference number offline payment to be reused if it has already been used for that same vendor.

Solution

If the error is for:

  • A bill:
    • Change the invoice number to something unique by clicking the Edit icon on the bill summary window
  • An offline payment:
    • Change the reference number to something unique by clicking the Edit icon on the bill payment information screen

 Alternatively, you can adjust your QuickBooks preferences to allow use of duplicate invoice or payment fields.

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