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

Explanation: This error happens when an estimate, invoice, or credit memo already exists in QuickBooks with the same number. QuickBooks won’t allow two of the same number.

QB Error - Duplicate Document Number

How to fix:

Since Credit Memos in QuickBooks will follow the same number sequence as the Invoices, you will want to update the starting number of these records in JobNimbus so they don’t create a conflicting number when they sync.

  1. In JobNimbus, navigate to Settings General
  2. Change the number that Estimates, Invoices, and Credit Memos start at in order to avoid numbering conflicts with QuickBooks
    1. Refer to this article for instructions on updating financial document ID numbers
  3. Locate the record with the duplicate error and click on the 3 dots > Duplicate

  4. Save the document
    1. This will create a new record associated with a new ID number that will sync
  5. Delete the original record that won't be able to sync due to the duplicate number.