[ULPIANUS libro quadragesimo tertio ad edictum. ] §18.4.17.prNomina eorum, qui sub condicione uel in diem debent, et emere et uendere solemus: ea enim res est, quae emi et uenire potest.
[ULPIAN, On the Edict, book 43.] We are accustomed both to buy and to sell the claims of those who owe under a condition or subject to a time limit; for that is a thing which can be bought and sold.