34The Court has already held that that principle precludes a pension scheme from eliminating discrimination contrary to Article 119 of the EC Treaty by removing, with retroactive effect, the advantages of the persons within the favoured category (see, to that effect, judgment of 28 September 1994, Avdel Systems, C‑408/92, EU:C:1994:349, paragraphs 5, 13, 14, 17 and 18).
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