Section 106(a) in The Punjab Panchayati Raj Act, 1994
(a)such number of offices of Chairmen and Vice-Chairmen of Panchayat Samitis in the district for the persons belonging to the Scheduled Castes and the number of such offices bearing as nearly as may be the same proportion to the total number of offices in the district as the population of the Scheduled Castes in the district bears to the total population of the district and such offices shall be allotted by rotation;