案情简介本案原告为四川某混凝土工程有限公司,被告为某工程局某公司西南分公司。原告从2009年2月22日至2009年4月4日期间为被告承建的成都市某农贸市场工程供应商品混凝土。2009年3月1日,被告以委托书的形式对相关混凝土供应事宜进行约定。原告向被告履行了供应义务,但被告在支付了部分混凝土工 Brief introduction of the case In this case, the plaintiff was a concrete engineering limited company in Sichuan. The defendant was a company southwest branch of an engineering bureau. From February 22, 2009 to April 4, 2009, the plaintiff supplied commercial concrete for a farmer’s market project in Chengdu contracted by the defendant. March 1, 2009, the defendant in the form of power of attorney agreed on the supply of concrete. The plaintiff fulfilled the supply obligation to the defendant, but the defendant was paying some of the concrete workers