“履行存在法律障碍”与“违反法律规定”的区别基本案情：甲乙两公司因联建房屋发生纠纷，在法院调解下甲乙双方达成调解协议，协议第三条约定：因乙公司为甲公司向案外人丙公司借款３０００万元提供财产抵押担保，甲公司愿以自有财产换回抵押物，免除乙公司担保责任。该调解 The difference between “performance of legal obstacles” and “violation of legal provisions” The basic case: A and B two companies due to the construction of housing disputes, mediation in court under the mediation agreement between A and B, Article III of the agreement: B company because the company A A foreign company C loan of 30 million yuan to provide property collateral, a company is willing to repay their own property collaterals, exempt from the company B guarantee responsibility. The mediation