UNAT held that UNDT did not commit an error of fact or law when it concluded that the difference of treatment between the Appellant and his former colleagues who had undergone a competitive selection process was lawful. UNAT held that it was reasonable and lawful to treat them differently at the time of deciding about the possible extension of his fixed-term appointment because equality meant not only the equal treatment of equals but also the unequal treatment of unequal. UNAT held that there was no flaw in the motivation of the impugned judgment that could result in a manifestly unreasonable...