(5)Irrespective of anything contained in this part or section 286, if any proceeding initiated under this part or any order of assessment or reassessment made under section 294(1)(c) has been annulled in an appeal or any other legal proceeding, then––(a)the assessment or reassessment or recomputation or reference or order relating to any tax year which has abated under sub-section (2) or (3), shall revive with effect from the date of receipt of the order of such annulment by the Principal Commissioner or Commissioner;(b)the revival, as referred to in clause (a) shall cease to have effect, if such order of annulment is set aside.