A valid assignment takes effect the moment it is made regardless of whether notice of the assignment is given to the other party to the contract. If the obligor is notified that there has been an assignment and that any money due must be paid to the assignee, the obligor's obligation can only be discharged by making payment to the assignee. In other words, payment to the assignor would not satisfy the contract after notice.
Para su conveniencia, debajo del texto en español le brindamos la versión completa de este formulario en inglés. For your convenience, the complete English version of this form is attached below the Spanish version.