legal ground
Article 545 of the Civil Code of People's Republic of China (PRC) * * * Creditors may assign all or part of their creditor's rights to a third party, except in one of the following circumstances: (1) According to the nature of the creditor's rights, they may not assign them; (two) according to the agreement of the parties shall not be transferred; (3) It shall not be transferred according to law. If the parties agree that the non-monetary creditor's rights cannot be transferred, they may not confront a bona fide third party. If the parties agree that the creditor's rights are not transferable, they may not oppose a third party. Article 546 Assignment of Creditor's Rights Without notifying the debtor, the assignment shall not have effect on the debtor. The notice of assignment of creditor's rights shall not be revoked, except with the consent of the transferee.