6. It is not in dispute that the Government of India vide its resolution, dated 29.8.2008 granted grade pay of Officers of the Department of Posts, Revenue, etc. who completed four years of regular service in the grade pay of Rs. 4800/- in Pay Band 2. According to the petitioner, he has already reached the pay scale of Rs. 7500-250-12000 by way of ACP Scheme on 1.1.2004 which is corresponding to the pay scale of Superintendent of Central Excise (Group B Post) and therefore, on completion of four years, he is entitled to the grade pay of Rs. 5400/- with effect from 1.1.2008. In support of his claim, the petitioner also relied upon a clarification issued by the Central Board of Excise and Customs in Letter F.No.A2601/98/2008-AdIIA, dated 21.11.2008 clarifying that the four year period is to be counted from the date on which an officer is placed in the pay scale of Rs. 7500-12000. However, the claim of the petitioner was denied based on the clarification issued by the Central Board of Excise & Customs, dated 11.2.2009, wherein, it was clarified that the Officers who got the pre-revised pay-scale of 7500-12000 (corresponding to grade pay of Rs. 4800) by virtue of financial upgradation under ACP would not be entitled to the benefit of further nonfinancial upgradation the pre-revised pay-scale of Rs. 8,000-13,500 (corresponding to grade pay of Rs. 5400) on completion of 4 years in the Prerevised pay scale of Rs. 7500-12000.