PSB Worksheet Position Costing

SELECT
pos.name posid
,bg.short_name bgname
,sp.service_package_short_name spname
,elm.currency_code currency_code
,round(sum(decode(budget_year_id,:p_budgeT_group_id1 ,nvl(element_cost,0),0)), 2) y1_amt
,round(sum(decode(budget_year_id,:p_budget_group_id2  ,nvl(element_cost,0),0)), 2) y2_amt
,round(sum(decode(budget_year_id,:p_budget_group_id3 ,nvl(element_cost,0),0)), 2) y3_amt
,round(sum(decode(budget_year_id,:p_budget_group_id4 ,nvl(element_cost,0),0)), 2) y4_amt
FROM  psb_ws_element_lines elm
     ,psb_ws_lines_positions lp
     ,psb_ws_position_lines pl
     ,psb_ws_service_packages_v sp
     ,psb_budget_groups bg
     ,psb_positions pos
where lp.worksheet_id = :p_global_worksheet_id and
 ((:cp_sequence_number is NULL AND elm.end_stage_seq is NULL) or    
  elm.current_stage_seq   = :cp_sequence_number) 
 and
     ( (:p_service_package_id is not null and sp.service_package_id = :p_service_package_id) or
       (:p_service_package_id is null ) ) and
      sp.service_package_id = elm.service_package_id and
      lp.worksheet_id = sp.worksheet_id and
      elm.position_line_id = lp.position_line_id and
      pl.position_line_id = lp.position_line_id and
      bg.budget_group_id = pl.budget_group_id and
      pos.position_id = pl.position_id and
      pl.copy_of_position_line_id is null and
     elm.end_stage_seq is null
group by bg.short_name,sp.service_package_short_name,pos.name,elm.currency_code
ORDER BY 2 ASC