In Roman law, the will of transferring the property was not contained in the notion of traditio, the effect of which was controlled by the theory of ‘cause’.In the eyes of most Roman jurists, the traditio, as a rule, is causal.Yet due to the insufficient knowledge of the notion `causa solvendi’ in Roman law, the doctrine of‘causa putative’was presented by the Middle Age scholars, making it possible to gradually generate the doctrine of abstract transfer from the frame of causal transfer doctrine. |