[POMPONIUS libro trigensimo primo ad Sabinum. ] §46.3.25.prEx parte heres institutus si decem, quae defunctus promiserat, tota soluit, pro parte quidem qua heres est liberabitur, pro parte autem reliqua ea condicet.
[POMPONIUS in the thirty-first book on Sabinus.] If a person appointed heir to a part has paid in full the ten which the deceased had promised, he will indeed be released for the part in respect of which he is heir, but for the remaining part, he will bring an action for its return.
sed si antequam condicat, ei adcreuerit reliqua pars hereditatis, etiam pro ea parte erit obligatus et ideo condicenti indebitum doli mali exceptionem obstare existimo.
But if, before he brings the action, the remaining part of the inheritance accrues to him, he will be liable also for that part, and therefore I think that the defense of fraud stands in his way when he sues for it as not being due.