主题：分组统计提示错误：已有相同的键

如下分组统计提示错误：已有相同的键。不知道是错在哪里

    Dim b1 As New SQLGroupTableBuilder("统计表1","员工周分析明细")
    Dim dt1 As fxDataSource
    b1.C
    b1.Groups.AddDef("门店") '根据产品分组
    b1.Groups.AddDef("营业员") '根据产品分组
    b1.Totals.AddDef("销售金额","本周销售金额_实际完成") '对数量进行统计
    b1.Filter = filter
    dt1= b1.BuildDataSource()

    Dim b5 As New SQLGroupTableBuilder("统计表5","员工周分析明细")
    Dim dt5 As fxDataSource
    b5.C
    b5.Groups.AddDef("门店") '根据产品分组
    b5.Groups.AddDef("营业员") '根据产品分组
    b5.Groups.AddDef("单号") '根据产品分组
    b5.Totals.AddDef("销售金额",AggregateEnum.max,"周大单金额") '对数量进行统计
    b5.Filter = filter
    dt5= b5.BuildDataSource()

Dim nms As String() =  {"门店","营业员"}
dt1.combine(nms,dt5,nms)

Tables(e.Form.Name & "_table3").DataSource = dt1