create procedure sys.sp_MSset_timestamp_bm
    @timestampbm varbinary(500) output,
    @objid int
as
begin
    declare @previouscolid smallint
    declare @colid smallint
    declare @columnordinal smallint

    set @timestampbm= 0x00

    if exists (select * from sys.columns where object_id = @objid and
                                               system_type_id = type_id('timestamp'))
    begin
        set @columnordinal= 0
        set @previouscolid= -1

        while (1=1)
        begin
            set @columnordinal= @columnordinal + 1

            set @colid= (select min(column_id) from sys.columns
                            where object_id = @objid and
                                  column_id > @previouscolid)

            if @colid is null
                break

            set @previouscolid= @colid

            if 'timestamp' = (select type_name(system_type_id) from sys.columns
                                where object_id = @objid and column_id = @colid)
            begin
                -- Use @colid for the @coltoadd parameter, not @columnordinal,
                -- because columns_updated() also behaves like this.
                exec sys.sp_MSsetbit @bm= @timestampbm output,
                                     @coltoadd= @colid,
                                     @toset= 1

                -- A table has at most one timestamp column.
                break
            end
        end
    end

    return 0
end

checkpoint