主题：[求助]

Select e.DataCol.Name
    Case "群组分类"
        If e.DataRow.IsNull("群组分类") Then
            e.DataRow("客户ID") = Nothing
        Else
            Dim lb As String = e.DataRow("群组分类")
            Dim idx As Integer
            idx = e.DataTable.Compute("Max(客户ID)","群组分类 = '" & lb & "' And [_Identify]<> " & e.DataRow("_Identify")) '取得该类别的最大编号
            e.DataRow("客户ID") = idx + 1
        End If
End Select

老师，上面的代码在使用时报错，以前是内部数据表，现在我用外部数据表主键列字段名称改为编号，现不知怎样修改上面的代码了。

Exception has been thrown by the target of an invocation.
Column '_Identify' does not belong to table 通信.