81Moreover, Clause 5 of the framework agreement does not lay down any specific penalties where instances of misuse have nonetheless been established. In that case, it is incumbent on the national authorities to adopt measures that are not only proportionate, but also are sufficiently effective and act as sufficient deterrent to ensure that the measures taken pursuant to the framework agreement are fully effective (see, to that effect, judgment of 24 June 2021, Obras y Servicios Públicos and Acciona Agua, C‑550/19, EU:C:2021:514, paragraph 47 and the case-law cited).
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