Section 5(2)(b) in The Scheduled Castes and Scheduled Tribes Orders (Amendment) Act, 1976
(b)any caste or tribe which is deemed to be both a Scheduled Caste and Scheduled Tribe in relation to a State or part thereof is varied so as to specify such caste or tribe only as a Scheduled Caste or Scheduled Tribe in relation to that State or part, the census authority shall take into account the population figures of such Scheduled Caste and Scheduled Tribe as ascertained in the last census: