I have a user who is receiving the below error when trying to open the Sales Order view page. I imagine it wants him to enter a value for the Tax Group Code but it will not even let him open the order window for him to do so. Is there some missing setup with regards to the tax on either the item and/or customer? The Item card for the particular item has a Tax Group Code and the customer's tax area code is set up properly. I even unchecked "Tax Liable" on the customer card but it still gives us the error.