UNAT concurred with UNDT that the Appellant neither appealed the administrative decision not to select him for the post, nor challenged the selection process or the JAB’s conclusion, but rather he discussed the release of a Confidential Letter which occurred after the selection process. UNAT held that UNDT was correct in finding that the appeal was not receivable with respect to the non-promotion. UNAT held that the Appellant failed to establish that UNDT committed errors warranting the reversal of its determination that his challenge to the decision to release the Confidential Letter was not...