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" 47. To put it in a nutshell, the change in the essential qualification made in 1990 or 1998 or the additional functions now required to be performed by the appellants could not retrospectively affect the initial recruitment of appellants as Data Processing Assistants nor their confirmation in 1989. Recruitment qualifications could not be altered for applied with retrospective effect so as to deprive the recruitees of their right to the posts to which they were recruited nor could it affect their confirmations."