41While the reason for such a reference back to national authorities for the purpose of establishing the specific rules for application of the term ‘successive’ within the meaning of the framework agreement is the concern to preserve the diversity of the relevant national rules, it is, however, to be remembered that the margin of appreciation thereby left to the Member States is not unlimited, because it cannot in any event go so far as to compromise the objective or the practical effect of the framework agreement. In particular, this discretion must not be exercised by national authorities in such a way as to lead to a situation liable to give rise to abuse and thus to thwart that objective (judgments of 4 July 2006, Adeneler and Others, C‑212/04, EU:C:2006:443, paragraph 82, and of 19 March 2020, Sánchez Ruiz and Others, C‑103/18 and C‑429/18, EU:C:2020:219, paragraph 58).
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