南京中院经济庭提供的W公司诉N公司无效购销合同纠纷案中含有三个合同关系,存在三方当事人,牵涉到对法律某些条文的理解、对实体法律关系和诉讼法律关系的认识不一致等问题,因而在审理过程中曾产生几种不同意见。本文拟根据该案案情,就以下几个问题加以探讨。 There were three contractual relationships between W Company v. N Company and N Company provided by Nanjing Intermediate Court Economic Chamber in the dispute of contract of purchase and sale. There were three parties concerned, which involved the understanding of certain provisions of the law, inconsistent understanding of substantive legal relations and procedural law relations Problems, and therefore had several different opinions during the trial. This article is based on the merits of the case, to discuss the following issues.