The UNDT did not err in deciding that Ms. Xing’s candidacy was given a full and fair consideration, in finding that the administrative instruction on gender parity (ST/AI/1999/9) did not apply in this case, and in not granting Ms. Xing’s request to amend her application. The UNDT has not been shown to have erred in requiring credible evidence of a clear and compelling nature of Ms. Xing’s allegations of ulterior motives, which was absent.