用友小张 请在参照界面的表体栏目中新增栏目,标题和名称自行输入,对应字段中输入以下语句(包含括号): (select top 1 code from (select ID as cid,b.cpoid as code from PO_Podetails a join PO_Pomain b on a.POID=b.POID) c where cid=$<子表标识> )