212It should be recalled that, in general, the principle of legal certainty precludes a European Union measure from taking effect from a point in time before that measure was published, it may exceptionally be otherwise where the purpose to be achieved so demands and where the legitimate expectations of those concerned are duly respected and, in so far as it follows clearly from the terms, objectives or general scheme of the rules of European Union law concerned, that such effect must be given to them (see judgment of 19 March 2009, Mitsui & Co. Deutschland, C‑256/07, EU:C:2009:167, paragraph 32 and the case-law cited).
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