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我在调试模式下对stock_quant 模型增加了几个自定义字段，产品设置的是按唯一序号追溯的。 我对产指定编号的产品记录进行了内部调拨操作后， 自己定义的字段的值会清除掉，该怎样设置才对保证自定义字段的值不丢失？