Customer default tax rate/area does not get displayed when alternative tax rate/areas are set

If the Alternative Tax Rate/Area is enabled in the company constants and a sales order is entered for a customer that does not have an alternative tax rate area set, a yellow warning appears stating that Alternative Tax Rate/Area is not defined. This is fine because it is a warning statement, that is true for this customer. 

However, at the sales order header entry, the screen does not display the default tax rate/area set for the customer set in customer master. If it is left blank and the order processed, then it can be see that the default tax rate/area did get applied and is visible if you go back into the order to view the sales order header.