77Admittedly, 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, particularly those of legal certainty and non-retroactivity, and that obligation cannot serve as the basis for an interpretation of national law contra legem (judgment of 19 March 2020, Sánchez Ruiz and Others, C‑103/18 and C‑429/18, EU:C:2020:219, paragraph 123 and the case-law cited).
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