主题：引用最后日期

If e.DataCol.Name = "识别号" Then
    Dim nms() As String = {"供货单位","入库时间"}
    If e.NewValue Is Nothing Then
        For Each nm As String In nms
            e.DataRow(nm) = Nothing
        Next
    Else
        Dim dr As DataRow
        dr = DataTables("入库明细").Find("[识别号] = '" & e.NewValue & "'")
        If dr IsNot Nothing
            For Each nm As String In nms
                e.DataRow(nm) = dr(nm)
            Next
        End If
    End If
End If

以上代码如何让“物料计划”表里面的入库时间自动提取“入库明细”表里面的最后一次入库时间，求代码。谢谢！