41In addition, since the referring court expresses doubts regarding the choice of the legal basis on which Directive 91/477 is founded, it should be noted that, in accordance with the Court’s settled case-law, the choice of legal basis for an EU measure must rest on objective factors that are amenable to judicial review; these include the aim and content of that measure. If examination of the measure concerned reveals that it pursues a twofold purpose or that it has a twofold component and if one of those is identifiable as the main or predominant purpose or component, whereas the other is merely incidental, that measure must be founded on a single legal basis, namely that required by the main or predominant purpose or component (judgment of 6 May 2014, Commission v Parliament and Council, C‑43/12, EU:C:2014:298, paragraphs 29 and 30 and the case-law cited).
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