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Quickbooks Error Code: (6240)


  • Quickbooks Error Code (6240): The name supplied already exists. : Another customer, supplier, or employee is already using this name. Please use a different name.


  • Clio Web App
  • Bill Syncing
  • Quickbooks Online

Additional Information:

  • Please note that when merging the Contacts you must ensure that the Contact with the Clio ID(ex. Clio 1234567) is the one that remains active. The original Contact in Quickbooks is the one that will need to be merged into the one with the Clio ID.
  • For a full list of Quickbook Error Codes click here.
  • To find Quickbooks errors click here.


This indicates that another Contact already exists in QBO with an identical Display Name. You will need to merge these Contacts within Quickbooks.


  1. Change the name of the Contact in Quickbooks. Example: John Doe to John1 Doe
  2. Visit the Quickbooks error code and click the Re-Sync button -or- wait a full day for Clio to try to sync over John Doe again
  3. Within Quickbooks navigate to John Doe (Clio 1234567)
  4. Select Edit
  5. Copy John Doe (Clio 1234567) within the Display name as field
  6. Navigate to the original John1 Doe in Quickbooks Online
  7. Select the Edit button
  8. Paste John Doe (Clio 1234567) into the Display name as field
  9. Select to save the Contact
  10. Select Yes within the prompt that asks if you would like to merge Contacts

If the above steps do not work, you can also attempt to change the Invoice ID Number. To make this change, please follow the steps below: 

  1. Navigate to the Bill you would like to Edit
  2. Click More Actions at the top right and select Edit
  3. At the top left click on the ID# field and enter desired Invoice Number
  4. Click Update Invoice


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