Only one A/R or A/P account allowed per transaction
This error is generated when the Unallocated Expenses Account selected in your sync preferences is something other than an expense account.
Update your Bill.com sync preferences for Unallocated Expenses Account to an expense type account:
- In Bill.com, go to the Gear Icon > Settings > Sync > Preferences
- Click Edit
- Change the Unallocated Expenses Account preference to an expense account
- Click Save