可以查考这里 http://www.foxtable.com/help/topics/2403.htm

呃......代码要改一下

Dim Max As String = e.DataTable.Compute("Max(编号)")
If max > "" Then
    e.DataRow("编号") = "RK" & Format(Cint(max.SubString(2)) + 1, "00")
Else
    e.DataRow("编号") = "RK01"
End If

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点击浏览该文件:蓝峰管理.table

老师好，入库单编号、入库编号明细还是不行。"编号"列不要有字母让字母直接在"入库单编号"列生成。入库编号明细我没有设置谢谢老师帮我了。

入库，Datacolchanged，代码

Select e.DataCol.Name
    Case "记录日期","编号"
        If e.DataRow.IsNull("记录日期") OrElse e.DataRow.IsNull("编号") Then
            e.DataRow("入库单编号") = Nothing
        Else
            Dim d As Date = e.DataRow("记录日期")
            Dim y As Integer = d.Year
            Dim m As Integer = d.Month
            Dim Days As Integer = Date.DaysInMonth(y,m)
            Dim fd As Date = New Date(y,m,1) \'获得该月的第一天
            Dim ld As Date = New Date(y,m,Days) \'获得该月的最后一天
            Dim bh As String = "RK" & Format(d,"yyMM") & "" \'生成编号的前缀
            If e.DataRow("入库单编号").StartsWith(bh) = False \'如果单据编号前缀不符
                Dim max As String
                Dim idx As Integer
                Dim flt As String
                flt = "记录日期 >= #" & fd & "# And 记录日期 <= #" & ld & "# And [_Identify] <> " & e.DataRow("_Identify")
                max = e.DataTable.Compute("Max(入库单编号)",flt) \'取得该月的相同工程代码的最大单据编号
                If max > "" Then \'如果存在最大单据编号
                    idx = CInt(max.Substring(bh.length,4)) + 1 \'获得最大单据编号的后四位顺序号,并加1
                Else
                    idx = 1 \'否则顺序号等于1
                End If
                e.DataRow("入库单编号") = bh & Format(idx,"0000")
            End If
        End If
End Select