38With regard to those requirements, it is settled case-law that as a general rule the principle of legal certainty precludes a measure implementing EU law from having retroactive effect. It may only exceptionally be otherwise, where an overriding reason in the public interest so demands and where the legitimate expectations of those concerned are duly respected (see, to that effect, judgment of 26 April 2005, ‘Goed Wonen’, C‑376/02, EU:C:2005:251, paragraphs 33 and 34 and the case-law cited).
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