i wanted to add a shipping surcharge based on region, so i added region list boxes to my checkout page for the billing and shipping areas.
i then set a session id to the option value of the shipping_region list box
i then have a shipping calculation which triggers if the sessionid is set correctly
i then edited the copy_Shipping.js ensuring the field names were correct, but the list box in my shipping area doesn't update when i click on the check box (all the others do)
have i missed something ? i have looked for typos and can't find any.