57In that regard, it should be noted that, according to settled case-law of the Court, the concept of ‘objective grounds’, within the meaning of Clause 4.1 of the Framework Agreement, must be understood as not permitting a difference in treatment between part-time workers and full-time workers to be justified on the basis that the difference is provided for by a general, abstract norm, such as a law or a collective agreement (judgment of 1 March 2012, O’Brien, C‑393/10, EU:C:2012:110, paragraph 64 and the case-law cited).
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