56That obligation to interpret national law in conformity with EU law is limited by the general principles of law, particularly those of legal certainty, and that obligation cannot serve as the basis for an interpretation of national law contra legem (see, to that effect, judgment of 16 July 2009, Mono Car Styling, C‑12/08, EU:C:2009:466, paragraph 61). However, although the obligation to interpret national law in a manner consistent with EU law cannot serve as the basis for an interpretation of national law contra legem, national courts must change their established case-law, where necessary, if it is based on an interpretation of national law that is incompatible with the objectives of a directive (judgment of 8 May 2019, Związek Gmin Zagłębia Miedziowego, C‑566/17, EU:C:2019:390, paragraph 49 and the case-law cited).
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