Why the Sync Error occurs
This error occurs when a bill that has been paid in Intacct has been updated in Bill.com with an additional new line item and the update attempts to sync to Intacct. A new line item on a bill cannot be synced to in Intacct after the bill has been paid.
How to Fix the Sync Error
Manually update the bill in Intacct and contact Customer Support to request that the sync error be removed.