Oracle Group by-Case

with shippedqty as (
  select sum(shipped_qty) as shpqty, source_salesitem_id
  from FACT_SHIPMENT_LINE
  where dim_org_id in (select dim_org_id from dim_org WHERE org_name like 'TSI%' AND org_name <> 'TSI FMS')
  group by source_salesitem_id
)
  select product.nsn_code,
  (CASE 
WHEN WHSE_CODE='EXE795' THEN 'TX'
WHEN WHSE_CODE='EXE796' THEN 'KUW'
WHEN WHSE_CODE<>'EXE795' AND WHSE_CODE<>'EXE796' THEN DLSF.whse_name

END) AS GAP,
        ven.vendor_name as Source,
        count(fsi.source_soline_id) as BO_num,
        sum(fsi.quantity - coalesce(sq.shpqty, 0)) as tirews_onBO, --qtyordered - qtydelivered
        min(od.THISDATE) as oldest_backorder
  from fact_salesitem fsi
  left join shippedqty sq on fsi.source_soline_id = sq.source_salesitem_id
  inner join dim_product product on fsi.dim_product_id  = product.dim_product_id
  inner join fact_pa_item pai on fsi.dim_product_id = pai.dim_product_id and pai.pa_isactive_ind = 'Y'
  inner join DIM_VENDOR ven on pai.DIM_VENDOR_ID = ven.DIM_VENDOR_ID
  left JOIN DIM_WHSE_BIN DLSF on FSI.DIM_WHSE_BIN_ID = DLSF.DIM_WHSE_BIN_ID
  INNER JOIN DIM_DATE od on FSI.CREATE_DATE_ID = od.DIM_DATE_ID
  INNER JOIN DIM_NAME_VALUES SOHS on FSI.DIM_NV_HDR_STATUS_ID = SOHS.DIM_NAME_VALUES_ID
  INNER JOIN DIM_NAME_VALUES SOLS on FSI.DIM_NV_LINE_STATUS_ID = SOLS.DIM_NAME_VALUES_ID
  WHERE FSI.DIM_ORG_ID IN (SELECT DIM_ORG_ID FROM DIM_ORG WHERE org_name like 'TSI%' AND org_name <> 'TSI FMS')
  and  SOLS.value_code in ('OH', 'BO') and  SOHS.value_code not in ('SC_AF')
  and product.nsn_code='2610-00-051-1270'
  group by product.nsn_code, (CASE 
WHEN WHSE_CODE='EXE795' THEN 'TX'
WHEN WHSE_CODE='EXE796' THEN 'KUW'
WHEN WHSE_CODE<>'EXE795' AND WHSE_CODE<>'EXE796' THEN DLSF.whse_name

END),ven.vendor_name;

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