Section 6(3)(a) in The Rajasthan Women and Child Development (State and Subordinate) Service Rules, 1998
(a)A person appointed on adhoc basis shall not be entitled to screening for a post higher than that to which he was initially appointed, if a person senior to him on a lower post who fulfilled qualifications prescribed for the post was either not given such adhoc appointment or is not entitled to screening under this rule. Seniority for this purpose shall be determined according to length of continuous service on a post;