[PAULUS libro secundo ad Plautium. ] §13.2.1.prSi obligatio lege noua introducta sit nec cautum eadem lege, quo genere actionis experiamur, ex lege agendum est.
[PAULUS, On Plautius, Book II] If an obligation is introduced by a new law, and it is not provided in the same law by what class of action we should proceed, an action must be brought based on the law.