QuickBooks Online Error: Business Validation Error: A project must be a subcustomer billed to its parent.

Why the sync error occurs:

This error occurs when a Quickbooks Online project listed as a customer in Bill.com, is updated in Bill.com. Since projects only sync one way to Bill.com from QuickBooks, updates to the customer profile in Bill.com won't sync to QuickBooks Online.

How to fix the sync error:

  1. In Bill.com, set the sync preference for Customers: Master in case of conflict to QuickBooks Online

    • Select Settings
    • Select Preferences under Sync
    • Select the Edit Icon
    • Select Quickbooks Online for Customers under Master in Case of Conflict
    • Select Save
  2. In QuickBooks Online, edit the project name

  3. Sync