Automatic Employee Tax Data check box on Installation Table and change of Provincial Tax Location

Using PS 9.2, when the Automatic Employee Tax Data box is checked on the Installation table and a change to the Provincial tax location code is made on Job Data, why is it that only the tax distribution is updated to the new Province of employment and Employee Tax Data is not also updated to reflect the change? Provincial statutory deductions are based upon the Province of employment, not that of residence. Why does the Automatic Employee Tax Data process not work for the Canadian Province like it does for U.S. State changes of UI location?