37Indeed, there must necessarily be a single occasion when a decision is made on the temporal effects of the requested interpretation, which the Court gives of a provision of Community law. In that regard, the principle that a restriction may be allowed only in the actual judgment ruling upon that interpretation guarantees the equal treatment of the Member States and of other persons subject to Community law, under that law, fulfilling, at the same time, the requirements arising from the principle of legal certainty.
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