[IDEM libro tertio stipulationum. ] §45.2.13.prSi reus promittendi altero reo heres extiterit, duas obligationes eum sustinere dicendum est.
[THE SAME, in the third book on Stipulations.] If one joint promisor becomes the heir to the other joint promisor, it must be said that he sustains two obligations.
nam ubi quidem altera differentia obligationum esse possit, ut in fideiussore et reo principali, constitit alteram ab altera perimi: cum uero eiusdem duae potestatis sint, non potest repperiri qua altera potius quam alteram consummari.
For where there can be a difference between the obligations, as in the case of a surety and a principal debtor, it is established that one is extinguished by the other; but when the two are of the same force, it cannot be found by what means one should be extinguished rather than the other.
ideoque et si reus stipulandi heres exstiterit, duas species obligationis eum sustinere.
And therefore, even if a joint stipulator becomes the heir, it must be said that he sustains two forms of obligation.