2. In the case of a relevant hereditament in relation to which, during a relevant period, a rateable value fails to be entered in a list, or a rateable value entered in a list falls to be altered, it shall be assumed, in applying paragraph 2(1) to (7) of Schedule 6 in relation to so much of the hereditament as was situated within an enterprise zone, that on the relevant day no area had been designated as an enterprise zone.