Judgment_paragraph 55 · Council of the European Union v Hamas (C-833/19 P)

55As to whether that ground of appeal is well founded, it must be noted, in the first place, that the principle of legal certainty requires that any act of the administration that has legal effects must be definitive, in particular as regards its author and content. Checking compliance with the requirement of authentication and, thus, of the definitive nature of the act is a preliminary to any other review, such as that of the competence of the author of the act, of compliance with the principle of collegiality or of the duty to provide reasons for the act (judgment of 6 April 2000, Commission v ICI, C‑286/95 P, EU:C:2000:188, paragraphs 45 and 46).