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请教各位大大一个问题有一张表demand，与另外一张表supply，是many2many的关系demand的表有一个form如下图[attachimg=1]点击add时，弹出选择框[attachimg=2]我的问题是，如何在选择框中获得demand的mpn，想实现supply的mpn与demand的mpn一致时，supply的数据才出现的选择框中OE中有类似的例子可以参考吗？