UNAT held that the UNDT’s judgment in Rosca was no longer good law, having been overruled by UNAT in Costa. UNAT held that time limits prescribed for administrative review and management evaluation (in the new system) could not be waived under Article 8(3) of the UNDT Statute, due to a specific prohibition in this respect contained in Article 8(4) of the UNDT Statute, as interpreted by UNDT in Costa and affirmed by UNAT. UNAT held that the application was time-barred and the delay in filing could not be condoned. UNAT dismissed the appeal and affirmed the UNDT judgment.