Dismissal is unlawful where the probationary period does not refer to a specific job

Dismissal for failure to pass the probationary period is unlawful where the trial cannot be identified in relation to the type of work performed, not even by reference to another document (per relationem). At the same time, the former employee is entitled to receive only five months’ pay if he or she promptly finds other well-paid employment.

Source: http://www.diritto24.ilsole24ore.com/art/guidaAlDiritto/dirittoCivile/2015-02-25/illegittimo-licenziamento-quando-prova-non-si-riferisce-un-lavoro-certo-183612.php