(5)It is not intended that the procedure laid down in the above paragraph should be applied with retrospective effect or that the verification of the past temporary officiating service of all government servants should be undertaken all at once. So far as the past service prior to April 1, 1932, is concerned, the former procedure should continue that is, an ad hoc verification should be made when the pension claim arises or is about to arise, in such individual cases in which there is any doubt; and the verification of service subsequent to the above date should be made in accordance with the above procedure.