53In that regard, it should be noted that, according to the Court’s settled case-law, the term ‘objective grounds’, within the meaning of Clause 4(1) of the Framework Agreement, must be understood as not permitting a difference in treatment between fixed-term workers and permanent workers to be justified on the basis that the different treatment is provided for by a general or abstract measure, such as a law or a collective agreement (judgments of 13 September 2007, Del Cerro Alonso, C‑307/05, EU:C:2007:509, paragraph 57, and of 22 December 2010, Gavieiro Gavieiro and Iglesias Torres, C‑444/09 and C‑456/09, EU:C:2010:819, paragraph 54, and order of 22 March 2018, Centeno Meléndez, C‑315/17, not published, EU:C:2018:207, paragraph 62).
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