28However, the principle that national law must be interpreted in conformity with EU law has certain limits. Thus, the obligation on a national court to refer to the content of a directive when interpreting and applying the relevant rules of domestic law is limited by general principles of law and it cannot serve as the basis for a contra legem interpretation of national law (see, to that effect, judgments of 15 January 2014, Association de médiation sociale, C‑176/12, EU:C:2014:2, paragraph 39 and the case-law cited, and of 13 December 2018, Hein, C‑385/17, EU:C:2018:1018, paragraph 51).
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