The petitioners are the respondents in O.A.No.709/2007 on the file of the Central Administrative Tribunal, Ernakulam Bench. The respondent herein is the applicant. He has been working as Gramin Dak Sevak Mail Deliverer (GDS MD) since 15.1.1997 under the petitioners. Since August 2006, he is officiating as a Casual Driver (Omni) under the 4th petitioner. 75% of the vacancies of the drivers arising in the department, as per the recruitment rules, shall be filled up by direct recruitment and remaining 25% vacancies are to be filled up from among the departmental candidates in the scale of pay below that of motor/lorry drivers. In 2004, the petitioners notified a vacancy for appointment against direct recruitment and it was filled up in 2007. The respondent and other applicants were not considered. While so, the 4th petitioner by Annexure-A1 dated 7.11.2007 notified one vacancy for the post of Jeep Driver. As per Annexure-A1, only Group-D officials with