Case F-103/05: Judgment of the Civil Service Tribunal (First Chamber) of 23 April 2008 — Pickering v Commission (Staff case — Officials — Remuneration — Correction coefficients — Transfer of part of remuneration out of the country of employment — Pensions — Default proceedings — Temporal application of the Tribunal's Rules of Procedure — Pay slips — Plea of illegality — Equal treatment of officials — Principle of protection of legitimate expectations, acquired rights, principle of legal certainty and the duty to have regard for the interests of officials — Obligation to state reasons)