(b) An agreement concluded after notification of the assignment between the assignor and the debtor of the receivable that affects the assignee's rights is ineffective as against the assignee unless:
(b) 在发出转让通知后转让人与应收款债务人之间订立的协议影响到受让人权利的，对受让人不具效力，除非有下列任何情形：