Update meerdere kolommen op basis van procentuele berekening in Oracle

ok, dus eindelijk, na heel veel verduidelijkingen, ziet het er zo uit:

+update:duplicaten

merge into TBL_FIBER_INV_SIGN_OFF_SHEET DST
using (
   -- Source: original query
   with mv as (
       select * from (
          select
             circle, 
             regexp_substr(MP,'[^/]+',1,1)MAINTENANCE_ZONE_NAME,
             regexp_substr(MP,'[^/]+',1,2)MAINTENANCE_ZONE_CODE,
             SPAN_TYPE,
             SPAN_LINK_ID,
             NE_LENGTH, -- ? NE_LENGTH - 1
             ROUTE_APPROVED_BY_CMM as CMM_APPROVED_LENGTH,
             row_number()over(partition by SPAN_LINK_ID order by ROUTE_APPROVED_BY_CMM) rn
          from TBL_FIBER_INV_CMP_REPORT_MV    
          where CMM_APPROVED_DATE IS NOT NULL 
             OR ROUTE_APPROVED_BY_CMM > 0 
             OR JOB_PROGRESS_FLAG = 1
       )
       where rn=1
   )
   ,pct as (
       SELECT 
          ROUND(SUM(NVL(CALCULATED_LENGTH,0)/1000),4) AS NE_LENGTH -- ? NE_LENGTH - 2
         ,ROUND(SUM(CASE WHEN RJ_CONSTRUCTION_METHODOLOGY NOT LIKE '%AERIAL%' 
                         OR RJ_CONSTRUCTION_METHODOLOGY IS NULL 
                         THEN NVL(CALCULATED_LENGTH,0) 
                         ELSE 0 
                    END)/1000,4
               ) AS UG_LENGTH
         ,ROUND(SUM(CASE WHEN RJ_CONSTRUCTION_METHODOLOGY LIKE '%AERIAL%' 
                         THEN NVL(CALCULATED_LENGTH,0) 
                         ELSE 0 
                    END)/1000,4
               ) AS AR_LENGTH
          FROM [email protected]_LINK_NE_VIEWER
   )
   select 
      mv.*
     --,cpt.*
     ,case when mv.CMM_APPROVED_LENGTH > pct.NE_LENGTH then 0.8 * pct.UG_length
           when mv.CMM_APPROVED_LENGTH = pct.NE_LENGTH then 0.9 * pct.UG_length
      end as FSA_UG
     ,case when mv.CMM_APPROVED_LENGTH > pct.NE_LENGTH then 0.2 * pct.AR_LENGTH
           when mv.CMM_APPROVED_LENGTH = pct.NE_LENGTH then 0.1 * pct.AR_LENGTH
      end as FSA_AERIAL
   from mv, pct
   -- end of Source query
) SRC
on ( dst.SPAN_LINK_ID =  src.SPAN_LINK_ID )
when matched then update
   set FSA_UG = src.FSA_UG
      ,FSA_AERIAL = src.FSA_AERIAL;