Legal basis: Article 543 of the Civil Code of People's Republic of China (PRC), the parties can modify the contract through consultation. Article 545 A creditor may assign all or part of its creditor's rights to a third person, except in any of the following circumstances: (1) No assignment may be made according to the nature of the creditor's rights; (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.