The transferor may not retain any interest in recidivism in the right of ownership. The interest of the assignee must be linked to the interest of the next person in the right of ownership. When temporal or interest interest is reserved by a rental client, the deed is not an assignment, but a sublease. Assignment is not mandatory in writing; However, the assignment contract must intend to transfer rights. The consequence of a valid assignment is that the right (i.e. the contractual relationship, including the right of recourse) between the assignor and the third party obliged is extinguished and a right is established between the debtor and the beneficiary of the assignment. . . .