17Second, it should be recalled that the right to paid annual leave is, as a principle of European Union social law, not only particularly important, but is also expressly laid down in Article 31(2) of the Charter of Fundamental Rights of the European Union, which Article 6(1) TEU recognises as having the same legal value as the Treaties (KHS, paragraph 37, and Case C-337/10 Neidel [2012] ECR, paragraph 40).
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