Why the Sync Error occurs
This error occurs when an account is deleted in Bill.com and the delete account is attempting to sync to QuickBooks Online (QBO) with the account set as Opening Balance Equity account in QBO.
How to Fix the Sync Error
The Opening Balance Equity account cannot be deleted or edited in QBO. The only options are to reactivate the deleted account in Bill.com or to contact Customer Support to request that the error is cleared.