主题：跨表更新问题

If e.DataCol.Name = "产品编号" Then
    If e.NewValue Is Nothing Then
        e.DataRow("品名") = Nothing
        e.DataRow("型号") = Nothing
        e.DataRow("规格") = Nothing
        e.DataRow("单价") = Nothing

        e.DataRow("日期") = Nothing    

    Else
        Dim dr As DataRow
        dr = DataTables("产品").Find("[产品编号] = '" & e.NewValue & "'")
        If dr IsNot Nothing
            e.DataRow("品名") = dr("品名")
            e.DataRow("型号") = dr("型号")
            e.DataRow("规格") = dr("规格")
            e.DataRow("单价") = dr("单价") 

            e.DataRow("日期") = dr("日期") 
        End If
    End If
End If

Select Case e.DataCol.Name
    Case "品名","型号","规格","单价","日期"
        Dim Filter As String = "[产品编号] = '" & e.DataRow("产品编号") & "'"
        Dim drs As List(Of DataRow) = DataTables("订单").Select(Filter)
        For Each dr As DataRow In drs
            dr(e.DataCol.Name) = e.NewValue
        Next
End Select

    上面的代码执行后，"品名","型号","规格","单价"都能更新，唯有"日期"列没有反映，是何原因？