36According to the settled case-law of the Court, the concept of ‘objective grounds’ within the meaning of clause 4(1) and/or (4) 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 difference is provided for by a general or abstract national measure, such as a law or collective agreement (judgment of 5 June 2018, Montero Mateos, C‑677/16, EU:C:2018:393, paragraph 56 and the case-law cited).
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