User multiple Relations in Dataset for Infragistics UltraWebGrid

I created a DataSet and add 2 tables in.

I want a hierarchical display so I setup 2 relations in ds. The problem is only the first relation work!!!
my code:

        DataSet ds = new DataSet();

        oca_teamTableAdapter teamTa = new oca_teamTableAdapter();
        DataTable dt = teamTa.GetData();
        ds.Tables.Add(dt);
        oca_userTableAdapter userTa = new oca_userTableAdapter();
        dt = new DataTable();
        dt = userTa.GetData();
        ds.Tables.Add(dt);

        ds.Relations.Add(ds.Tables["team"].Columns["id"], ds.Tables["team"].Columns["parent_id"]);//self referencing here
        ds.Relations.Add(ds.Tables["team"].Columns["id"],ds.Tables["user"].Columns["branch"]);
       
        UltraWebGrid1.DisplayLayout.ViewType = ViewType.Hierarchical;
       
       
        UltraWebGrid1.DataSource = ds.Tables["team"];
        UltraWebGrid1.DataBind();

Can we apply multiple relation in ultrawebgrid? if so what is the problem here?

Cheers,
EltonStart Free Trial