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QuickBooks Online Sync Error: You must specify a different number. This number has already been used.

Error

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

 

Explanation

This error occurs when the bill number is already in use in QuickBooks Online, for a bill already marked as Paid. If the bills are in both systems as unpaid, this error message should not appear.

 

Solution

Use an alternate bill number.

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