87In that regard, the Court has held, firstly, that res judicata extends only to the matters of fact and law actually or necessarily settled by the judicial decision in question (Commission v Luxembourg paragraph 27; and Thyssenkrupp Nirosta v Commission paragraph 123) and, secondly, that the force of res judicata attaches not only to the operative part of that decision, but also to the ratio decidendi of that decision which is inseparable from it (Joined Cases C-442/03 P and C-471/03 P P & O European Ferries (Vizcaya) and Diputación Foral de Vizcaya v Commission [2006] ECR I-4845, paragraph 44).
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