Section 27(f) in Tamil Nadu Government Servants (Conditions of Service) Act, 2016
(f)If qualified and suitable candidates belonging to any of the Backward Classes, Backward Class Muslims including the Most Backward Classes and Denotified Communities are not available for selection for appointment by recruitment by transfer or by promotion in the turns allotted to them, the turns so allotted shall lapse and the selection for appointment for the vacancies shall be made by the next turn in the order of rotation:
