82Moreover, although the authority of res judicata exerted by an annulling judgment of a court of the EU judicature attaches to both the operative part and the reasoning that constitutes the ratio decidendi of the judgment, it cannot entail annulment of an act not challenged before the EU judicature but alleged to be vitiated by the same illegality (judgment of 14 September 1999, Commission v AssiDomän Kraft Products and Others, C‑310/97 P, EU:C:1999:407, paragraph 54).
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