Case T-605/18: Judgment of the General Court of 12 February 2020 — ZF v Commission (Civil service — Members of the temporary staff — Pension — Decision determining pension rights — Pension statements — Action for annulment — Time limit for lodging a complaint — Delay — Purely confirmatory act — Partial inadmissibility — Recovery of undue payments — Classification in grade and step — Multiplication factor — Withdrawal of an unlawful act — Legitimate expectation — Reasonable time)