Well its either:
case when cli in (4244,6454654) then 'Approved' end as status,
Or:
case when apps in (25,5) then 'In process' else 'other' end as req
Or both. Basically your comparing a variable of type numeric to character or vice versa.
If you had provided either/or - test data in the form of a datastep, the actual log output, I could be more specific.