28Such an impediment is permissible only if it relates to situations which are not objectively comparable or if it can be justified by overriding reasons of the public interest recognised by EU law. It is further necessary, in such a case, that it is appropriate for ensuring the attainment of the objective in question and does not go beyond what is necessary to attain that objective (judgment of 29 November 2011, National Grid Indus, C‑371/10, EU:C:2011:785, paragraph 42 and the case-law cited).
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