Section 9(1)(a) in Andhra Pradesh Panchayat Raj Act, 1994
(a)such number of seats to the 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 Gram Panchayat, as the population of the Scheduled Castes, or as the case may be, Scheduled Tribes in that village bears to the total population of that village, and such seats may be allotted by rotation to different wards in a Gram Panchayat;