Just like the Roman contractual system, the whole range of condic­tiones supplementing it was received into the ius commune;

and although the creation of a generalized law of contract was bound to jeopardize the basis on which they had once been devised, the Roman condictiones proved extraordinarily long-lived and made their way into many modern legal systems. To this day, they form the foundation of the South African law of unjustified enrichment and even make a somewhat quaint appearance in the German BOB. They are all still unmistakably Roman, but both their function and range of application have changed considerably. This is particularly obvious in the case of the condictio causa data causa non secuta.