[IDEM libro quarto decimo ad Plautium. ] §18.4.7.prCum hereditatem aliquis uendidit, esse debet hereditas, ut sit emptio: nec enim alea emitur, ut in uenatione et similibus, sed res: quae si non est, non contrahitur emptio et ideo pretium condicetur.
[THE SAME, On Plautius, book 14.] When someone has sold an inheritance, the inheritance must exist in order for there to be a sale; for it is not a chance that is bought, as in the case of a hunt and the like, but a thing; and if this does not exist, no sale is contracted, and therefore the price will be recovered by condictio.