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刚开始录入原材料数据的时候没有意识到修改计量单位是不能跨类别的，结果现在很多原材料类别是默认的件...崩溃啊~经过 重庆-mrshelly 的指点，在 件 下新建相关的计量单位进行换算。不知道还有没有其它方法？