Xero sync error: Vendor Credit cannot be updated because credit may have already been applied in Xero

Why the sync error occurs

This error occurs when a vendor credit is applied to a bill in Bill.com and the sync is attempting to apply the credit in Xero, but the credit was already been applied manually in Xero.

How to fix the sync error

There are two options to resolve this issue:

Updating in Xero

1. In Xero, unapply the vendor credit
2. In Bill.com, run the sync again

Updating in Bill.com

1. Confirm that the credit is applied correctly in Xero
2. Select Resolve on the sync status page in Bill.com
3. Select the option to sync future updates
4. Select Confirm