UNAT held that UNDT did not make any errors of law and fact when it concluded that the Administration, having issued the offer of appointment on the basis of a factual error to an ineligible candidate who was legally barred from being recruited, had a duty to withdraw the offer, as soon as the mistake was discovered; and that the Administration was legally precluded from issuing a letter of appointment to the Appellant. UNAT held that, on the basis that it had concluded that UNDT did not make any errors of law and fact, it was unnecessary to examine the other grounds of appeal advanced by the...