§ 994 The issues formed may be tried as in other cases; but when the defendant denies, in his answer, any liability on the obligation upon which the judgmen…

The issues formed may be tried as in other cases; but when the defendant denies, in his answer, any liability on the obligation upon which the judgment was rendered, if a verdict be found against him, it must be for not exceeding the amount remaining unsatisfied on such original judgment, with interest thereon.