you have a syntax error with "then" and you must use ' for text value and " for alias 


Select item as "Item",
case koor
  when 1 then 'Production Order'
  when 2 then 'Purchase Order'
  when 3 then 'Sales Order'
END as "Order Type"  ,
case kost
  when 4 THEN 'Purchase Receipt'
  else 'Test'
end,
trdt_loc as "location"
from whinr110
where item like '%CISN-UCSC-PSU2-1200=%'