JUDGMENT : P.V. ASHA, J. 1. All these Writ Petitions relate to appointment to the post of Sub Engineers by direct recruitment in the 10% quota for the employees of the Kerala State Electricity Board (‘Board’ for short). Hence these Writ Petitions were heard together and being disposed of by this common judgment. The parties and documents referred to in this judgment are as described in W.P. (C) No.31433/2014, unless otherwise specified. 2. The petitioners in all these Writ Petitions are employees of the Board, who submitted applications pursuant to Ext.P19, a notification published in Kerala gazette dated 31.12.2011 issued by the Kerala Public Service Commission (‘PSC’ for short) as category no.487/11, for appointment to the post of Sub Engineers by direct recruitment against vacancies in the 10% departmental quota. The method of appointment was notified as : direct recruitment (through departmental quota from the qualified employees who are working in KSEB). The qualification prescribed was 1. S.S.L.C. or its equivalent as General Educational qualification. Technical qualifications were: Diploma in Electrical Engineering of a recognized institution after 3 years course of study or Diploma in Electrical and Communication of a recognized institution or a certificate in Electrical Engineering from any one of the recognized technical school mentioned therein with 5 years’ service under the K.S.E.B. or MGTE/KHTE in Electrical Lights and Power (Higher) with 5 years experience as Second Grade Overseer under the Board. 37 vacancies were notified. The candidates who had completed probation alone were eligible to apply and they were required to obtain and keep a service certificate to prove the length of their service in the respective category from the Board in the format given, to be produced as and when called for. Being fully qualified as per the notification, the petitioners submitted their applications. They appeared in the written/OMR test held on 20.7.2013. On 30.09.2014, PSC published Ext.P20 short list of candidates who were successful in written/OMR test. The register numbers of the petitioners were included in that short list. In Ext.P21 notification in the website PSC notified the dates for verification of certificates of the successful candidates included in the short list. Based on Ext.P21, the petitioners reported in the respective schools for certificate verification. In the Notice Board of the school, where they reported an erratum notification of Ext.P19 was seen pasted as contained in Ext.P22. In Ext.P21 notification in the website PSC notified the dates for verification of certificates of the successful candidates included in the short list. Based on Ext.P21, the petitioners reported in the respective schools for certificate verification. In the Notice Board of the school, where they reported an erratum notification of Ext.P19 was seen pasted as contained in Ext.P22. By this erratum notification dated 18.09.2012, the eligibility of candidates for submitting applications pursuant to the notification dated 31,12,2011 i.e. Ext P19, for appointment against the 10% departmental quota from among qualified employees working in the Board was corrected to be read as “Direct recruitment (10% of the vacancies by recruitment of persons who are in the service of the Board possessing the prescribed qualifications for direct recruitment and have put in not less than 3 years’ service in the next lower category)”. Seeing this notification, the petitioners immediately approached this Court as they were informed that in the absence of 3 years’ service in the next lower category, their certificates would not be verified and they would not be considered for the selection. 3. On the basis of the interim orders passed by this Court, the certificate verification/interview in respect of all these petitioners was undertaken, subject to further orders from this Court. 4. The petitioners are challenging this erratum notification as well as the action of the P.S.C in insisting 3 years’ service in the next lower category for selection and appointment under the 10% quota. It is pointed out that, the notification Ext.P19 did not contain any prescription regarding qualifying service or any prescription that the candidate should be in the next lower category, as eligibility for selection under the 10% quota. It is the case of the petitioners that the erratum notification was never published in Kerala gazette (extra ordinary) as in the case of the original notification. Such an alteration of qualification was never made known to the applicants, by any process known to law; the PSC cannot change the rules of the game in the midway and exclude candidates like the petitioners. Such an alteration of qualification was never made known to the applicants, by any process known to law; the PSC cannot change the rules of the game in the midway and exclude candidates like the petitioners. There are serious allegations raised in these Writ