“There is no statutory provision that the promotion to the post of Scientist 'B' should take effect from 1st July of the year in which the promotion is granted. It may be that, rightly or wrongly, for some reason or other, the promotions were granted from 1st July, but we do not find any justifying reason for the direction given by the Tribunal that the promotions of the respondents to the posts of Scientists 'B' should be with effect from the date of the creation of these promotional posts. We do not know of any law or any rule under which a promotion is to be effective from the date of creation of the promotional post. After a post falls vacant for any reason whatsoever, a promotion to that post should be from the date the promotion is granted and not from the date on which such post falls vacant. In the same way when additional posts are created, promotions to those posts can be granted only after the Assessment Board has met and made its recommendations for promotions being granted. If on the contrary, promotions are directed to become effective from the date of the creation of additional posts, then it would have the effect of giving promotions even before the Assessment Board has met and assessed the suitability of the candidates for promotion. In the circumstances, it is difficult to sustain the judgment of the Tribunal."