select ...
max(case when RUN < 1000 when D end) over (partition by CUSTOMER_ID)
from (
select CAL.D                             as "D"
...
, case
    ...
  end * nvl(K.FACTOR,1)                  as "FEE"
, sum(case
    ...
  end * nvl(K.FACTOR,1))
  over (partition by S.CUSTOMER_ID order by S.CUSTOMER_ID, CAL.D, S.LOGIN)
                                         as "RUN"
...
)