Case F-4/07: Judgment of the Civil Service Tribunal (First Chamber) of 21 February 2008  — Skoulidi v Commission (Staff cases — Officials — Exchanges of officials between the Commission and the Member States — Making available an EU official to the Greek administration — Refusal — Action for damages — Non-pecuniary loss — Pre-litigation procedure — Admissibility — Substantive conditions giving rise to the non-contractual liability of the Community)