Exchange of reservation between communities

The reserved vacancies in appointments shall be exchanged between the Scheduled Castes and Scheduled Tribes in the event of non-availability of candidates from the respective communities, but the vacancies reserved for a particular community shall continue to be reserved for that community only for two recruitment years and if candidates are not available for appointment in particular reserved vacancies in the third year, the vacancy so filled by exchange shall be treated as reserved for the candidates of that particular community who are actually appointed.