Section 152(1)(a) in Andhra Pradesh Panchayat Raj Act, 1994
(a)such number of seats to the members belonging to Scheduled Castes and Scheduled Tribes as may be determined by him, subject to the condition that the number of seats so reserved shall bear, as nearly as may be, the same proportion to the total number of seats to be filled by direct election to the [Mandal Praja Parishad] [Substituted 'Mandal Parishad' by Act No. 41 of 2006, dated 23.9.2006.], as the population of the Scheduled Castes, or as the case may be, the Scheduled Tribes in that Mandal bears to the total population of that Mandal, and such seats may be allotted by rotation to different constituencies in a [Mandal Praja Parishad] [Substituted 'Mandal Parishad' by Act No. 41 of 2006, dated 23.9.2006.] in the manner prescribed.