Why the Sync Error occurs
This error occurs when a vendor credit in Bill.com is attempting to sync to QuickBooks Online, but the reference number is already in use on a vendor credit in QuickBooks Online.
How to Fix the Sync Error
If the credit does not exist in QuickBooks Online
- Change the vendor credit reference number in Bill.com to a unique number
- Sync again
If the credit already exists in QuickBooks Online or if no duplicate number is found in QuickBooks Online
Contact Customer Support for assistance