【裁判要旨】商品房买卖合同和二手房买卖合同是两个不同的法律关系,分别对应着不同的权利义务主体。当房屋的实际面积与合同约定的销售面积出现误差的时候,根据合同相对性原则,只有直接的合同当事人之间可以主张权利或承担义务。房屋是否转卖,并不影响权利人依据合同主张权利。 Referee motto] Commercial housing sales contracts and second-hand housing sales contracts are two different legal relations, respectively, corresponding to different rights and obligations of the main body. When the actual area of ​​the house is contracted with the sales area stipulated in the contract, according to the principle of contractual relativity, only the direct contracting parties can claim rights or undertake obligations. Whether the resale of houses does not affect rights holders claim rights under the contract.