When I update an Order by adding untaxed items to it, it doesn’t sync to QuickBooks. How to fix?

The user adds a taxed item in an Order and syncs them with QuickBooks. Then, after successful sync, the user removes the taxed items and adds untaxed items to the Order and tries to sync them with QuickBooks. This results in the following error:

The solution is to create a new Order specifically for the untaxed items and then sync them with QuickBooks.