Employee of Pakistan Broadcasting Corporation drawing basic pay at Rs.2,800 in BPS-18 as Assistant News Editor—Such employee left Corporation after joining Education Department as Assistant Professor (BPS-18) through Public Service Commission and proper channel—Fixation of pay of such employee in Education Department at Rs.2,100 as initial stage of BPS-18—Validity— Such employee would be entitled to protection of his last pay drawn in Corporation in BPS-18 from the date of joining Education Department—Principles.