Medical allowance for pensioners-Employee of Pakistan Railways allowed move over to BS-16 claiming benefit of medical allowance for BS-15 employees on the basis that his substantive grade at time of his retirement was BS-15-Held, that respondent-employee had opted for move-over to BS-16 in which he chose to retire and was granted pension on the basis of last drawn pay of BS-16 and medical allowance of 20% of the pension permissible to those in BPS-16-Medical allowance was payable on the pension drawn-In view of the fact that the respondent admittedly drew pension calculated on the basis of his last drawn pay which was that of BS-16, he was correctly paid medical allowance @ 20% of the pension drawn-Respondent was actually claiming two benefits; while on the one hand he was drawing pension calculated on the basis of his last drawn pay in BS-16 and on the other hand he claimed benefit of a higher medical allowance at the rate of 25% of pension payable to persons retiring in BS-15, which is contrary to the plain language of the relevant Office Memorandum—Appeal was allowed, and impugned judgment of Service Tribunal allowing respondent medical allowance of 25% of the pension was set aside.