Case T-272/03: Judgment of the Court of First Instance of 13 September 2005 — Fernández Gómez v Commission (Staff cases — Temporary agent — Article 2(a) of the CEOS — Admissibility — Confirmatory act — Limitation of the duration of the contract — Possibility of renewal — Anti-overlap rule — Period worked as a national expert on secondment — Discretionary power of the Commission)