主题：[求助两表多列字段关联问题

我重复执行下面代码，没问题

If Relations.Contains("po") Then
    Relations.Delete("po")
End If

Dim ParentCol(1) As DataCol
Dim ChildCol(1) As DataCol
ParentCol(0) = DataTables("表A").DataCols("第一列")
ParentCol(1) = DataTables("表A").DataCols("第二列")
ChildCol(0) = DataTables("表B").DataCols("第一列")
ChildCol(1) = DataTables("表B").DataCols("第二列")
Relations.Add("po", ParentCol, ChildCol)
msgbox(1)