43The limits on the discretion left to the Member States, mentioned in paragraph 41 of the present judgment, are most particularly necessary in respect of a key concept, such as whether employment relationships are successive, which is determinative of the definition of the very scope of the provisions of national law designed to implement the framework agreement (judgment of 19 March 2020, Sánchez Ruiz and Others, C‑103/18 and C‑429/18, EU:C:2020:219, paragraph 60).
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