Section 261(4) in Rajasthan Panchayati Raj Rules, 1996
(4)Appointments shall be made strictly in accordance with the rosters prescribed separately for direct recruitment and promotion. In the event of non-availability of the eligible and suitable candidates amongst the Scheduled Caste or Scheduled Tribe, as the case may be, in a particular year, the vacancies so reserved for them shall be tilled in accordance with the normal procedure and an equivalent number of additional vacancies shall be reserved in the subsequent year. Such of the vacancies which remain so unfilled shall be carried forward to the subsequent three recruitment years in total and thereafter such reservation would lapse.