主题：[求助]大侠帮我看看，出错了！！！

Dim nd1 As String
nd1 = DataTables("明细").Compute("max(预算年度)")   
Dim nd2 As String=nd1-1

Dim g1 As New GroupTableBuilder("统计表A", DataTables("明细"),"预算类型='年初预算'and [预算年度] in (nd1,nd2)")
g1.Groups.AddDef("单位编号")
g1.Groups.AddDef("单位名称")
g1.Totals.AddDef("支出合计")
g1.Filter = "预算类型='年初预算'and [预算年度] in (nd1,nd2)"
g1.Build()

出错了显示“未找到列 [nd1]”