FMS with case statement

Hi All,

I want to run below FMS on marketing document but its showing error.

Select (Case when t0.itemtype = 'F' then 'FA Item'

              when t0.itemType = 'I' and t0.inventitem='Y' then 'Stock Item' when t0.itemtype = 'I' and t0.inventitem= 'N' then 'Non Stock Item') from oitm t0 where t0.itemcode = $[$38.1.0]

Thanks in advance