137Moreover, the obligation to state the grounds on which a decision adversely affecting an official is based constitutes an essential principle of EU law which may be derogated from only for compelling reasons (see judgments of 29 September 2005 in Case T‑218/02 Napoli Buzzanca v Commission, paragraph 57 and the case-law cited, and of 8 September 2009 in Case T‑404/06 P ETF v Landgren, paragraph 148 and the case-law cited).
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