61It is therefore for the national authorities to adopt proportionate, effective and dissuasive measures to ensure that the rules adopted pursuant to the framework agreement on fixed-term work, which can provide, for that purpose, for the conversion of fixed-term contracts into contracts of indefinite duration, are fully effective. However, where the improper use of successive fixed-term employment relationships has taken place, a measure must be capable of being applied in order to penalise duly that abuse and to nullify the consequences of the breach (judgment of 11 February 2021, M.V. and Others (Successive fixed-term contracts in the public sector), C‑760/18, EU:C:2021:113, paragraphs 57 to 59).
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