105In any event, mere administrative practices, which by their nature are alterable at will by the authorities and are not given the appropriate publicity, cannot be regarded as constituting the proper fulfilment of obligations to transpose a directive (see, in particular, Case C-507/04 Commission v Austria [2007] ECR I-5939, paragraph 162 and case-law cited). In the same way, an interpretation, by national courts, of the provisions of domestic law in accordance with those of a directive cannot in itself achieve the clarity and precision needed to meet the requirement of legal certainty (see Commission v Ireland, paragraph 47 and case-law cited).
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