SELECT VoGroup.NAME,
       VoGroup.VEHICLE_OWNER_ID,
       VoGroup.VO_GROUP_ID,
       VoGroup.Parent_Vo_Group_Id,
VoGroup.COMPANY_NR,
       gu.gui_user_id
  from (SELECT VoGroup.vo_Group_id,
       VoGroup.name,
       VoGroup.Vehicle_Owner_Id,
       VoGroup.Parent_Vo_Group_Id,
VoGroup.COMPANY_NR
  FROM VO_GROUP VoGroup
 START WITH VoGroup.Parent_Vo_Group_Id IS NULL
CONNECT BY VoGroup.Parent_Vo_Group_Id = PRIOR VoGroup.Vo_Group_Id
 order SIBLINGS by VoGroup.name) VoGroup,
   (select *  from gu_vehicle_owner
                     where gui_user_id = ?
                       and vehicle_owner_id = ?) gu
 where VoGroup.vo_group_id = gu.vo_group_id(+)
 and VoGroup.vehicle_owner_id = ?