Section 2(1)(vii) in All India Services (Death-Cum-Retirement Benefits) Rules, 1958
(vii)In the case of a member of Service, who while officiating in a higher post proceeds on leave and retires or dies while on leave, the benefit of officiating or temporary pay for the purposes of this clause and clause (bb) shall be given only if it is certified that the member of the Service would have continued to hold the higher officiating or temporary appointment but for his proceeding on leave.