Joined Cases F-72/12 and F-10/13: Judgment of the Civil Service Tribunal (Second Chamber) of 21 November 2013 — Roulet v Commission (Civil Service — Remuneration — Article 66 of the Staff Regulations — Former member of the temporary staff at Grade AD12 — Recruitment as an official at Grade AD6 — Payment of remuneration equivalent to that paid to an official at Grade AD12 — Manifest error — Recovery of undue payments under Article 85 of the Staff Regulations)