Judgment of the Court of First Instance of 27 March 2003 in Case T-33/00: Natalia Martínez Páramo and Others v Commission of the European Communities (Officials — Competition — Selection board — Decision of the selection board not admitting candidate to oral tests — Scope of obligation to provide reasons — Scope of judicial review — Requests for reexamination of marking — Compliance with rules governing the work of selection boards — Manifest error)