Issue:

• Trust Transactions Not Syncing to Quickbooks Online with Sync Error 6140
• Quickbooks Error Code (6140): Duplicate Document Number Error 
• Quickbooks Error Code (6140): This number has already been used. DocNumber=(Number) is assigned to Journal Entry

Environment:

• Clio Manage

Additional Information:

These resolution steps are specific to manually entered Trust Transactions unrelated to payments against Bills or Trust Requests.

Cause:

• A specific setting was enabled in Quickbooks Online resulting in Trust Transaction sync error (6140): Duplicate Document Number Error. 
• It could also be caused if a Manual Journal entry was made in Quickbooks and now Clio is trying to make a new Journal entry with that same number

Resolution:

In Quickbooks Online:

1. Select Settings
2. Select Advanced Settings
3. Disable “Warn if duplicate journal number is used”

In Clio:

1. Select Settings
2. Select Bill Syncing 
3. Locate the Error Code by scrolling down 
4. Click Retry
5. Wait for the next sync cycle to re-sync.
6. If the steps above don't work, the manual journal entry may have to be deleted.