Case F-50/15: Judgment of the Civil Service Tribunal (3rd Chamber) of 12 May 2016 — FS v EESC (Civil service — Temporary staff — Article 2(c) of the CEOS — Member of the temporary staff employed in order to carry out the duties of head of unit ‘for a group of the European Economic and Social Committee’ — Second paragraph of Article 44 of the Staff Regulations — Advancement in step granted retroactively at the end of a nine-month probationary period — Application by analogy to members of the temporary staff not provided for ratione temporis in the CEOS — Sui generis probationary period decided upon by contract outside the situations referred to in the CEOS — Extension of the contractual probationary period — Performance as head of unit held to be unsatisfactory — Reassignment to a non-management post — Entitlement to the advancement in step provided for in the second paragraph of Article 44 of the Staff Regulations)