According to Ruling n. 26464 issued by the Court of Cassation on 21 December 2016, it is lawful to dismiss a Manager who takes holidays without agreeing to the timing with the employer in advance.
Indeed, the Court stated that while the Manager can decide on when to takes his holidays, this has to be balanced/limited by the duty to consult with his employer beforehand, in order to agree on the timing.
In this regard, such an obligation can either be provided in the Collective and/or individual employment agreement.