APPENDIX 2 525 the case in regard to the part for which the creditor asserts his right of revocation; if the act is revoked according to law,the act is void ab initio. If two or more creditors bring actions of revocation against the same debtor and in respect of the same subject matter,the people's court may combine the proceedings. Article 26 The necessary expenses disbursed by the creditor in exercising his 10.027 right of revocation,such as the attorney's fee and travel expenses,shall be borne by the debtor.If the third party is at fault,he shall bear an appropriate share of the same. VI.The Third Party in the Transfer of Contract Article 27 If,after the creditor assigns his contractual right,the debtor and the 10.028 assignee have a dispute over the performance of the contract and bring an action to a people's court,the creditor may be joined as a third party if the debtor invokes a defence against the creditor's right. Article 28 If,after the debtor transfers his contractual obligation with the consent 10.029 of the creditor,the transferee and the creditor have a dispute over the perform- ance of the contract and bring an action to a people's court,the debtor may be joined as a third party if the transferee invokes a defence in respect of the debtor's right against the creditor. Article 29 If,after a party to the contract transfers both his rights and obligations 10.030 under the contract to the transferee with the consent of the other party,the other party and the transferee have a dispute over the performance of the contract and bring an action to a people's court,the transferor may be joined as a third party if the other party invokes a defence in relation to the rights and obligations under the contract. VII.Concurrence of Claims Article 30 If the creditor,upon bringing an action in the people's court,makes the 10.031 choice pursuant to art.122 of Contract Law,but modifies his claim before the opening of the trial at the first instance,the people's court shall allow it;if the other party objects to the jurisdiction,the people's court shall dismiss the action if the obiection is sustained after review