Section 23A

No officer shall be considered for promotion unless he is substantively appointed and confirmed on the next lower post. If no officer substantive in next lower post is eligible for promotion, officers who have been appointed on such post on officiating basis after selection in accordance with one of the methods of recruitment or under any Service Rules promulgated under proviso to Article 309 of the Constitution of India, may be considered for promotion on officiating basis only in the order of seniority in which they would have been had they been substantive on the said lower post.