Error 79-322: Expecting a THEN

[deenap29]

For the case statement below, I keep getting the error in red. Not sure where a then is missing? Please help!!! 

70 /* Include Owner? */
71 (CASE
72 WHEN THEN 'N'
___
79
73 WHEN THEN 'N'
___
79
ERROR 79-322: Expecting a THEN.

74 WHEN '949 IRVING' = t1.current_owner_fn THEN 'N'
75 WHEN 'CLAIMS INTAKE - LIBERTY MUTUAL (CL)' = t1.current_owner_fn THEN 'N'
76 WHEN 'CLAIMS INTAKE - LIBERTY MUTUAL (CL) SUPPORT' = t1.current_owner_fn THEN 'N'
77 WHEN 'GENERAL AM INBOX - LIBERTY MUTUAL (CL)' = t1.current_owner_fn THEN 'N'
78 WHEN 'LIBERTY MUTUAL COMMERCIAL SUBRO' = t1.current_owner_fn THEN 'N'
79 WHEN 'LIBERTY MUTUAL INS - COMMERCIAL CLAIMS' = t1.current_owner_fn THEN 'N'
80 ELSE 'Y'
81 END) FORMAT=$CHAR43. LABEL="Include Owner?" AS 'Include Owner?'n,

Case statement: 

CASE
WHEN THEN 'N'
WHEN THEN 'N'
WHEN '949 IRVING' = t1.current_owner_fn THEN 'N'
WHEN 'CLAIMS INTAKE - LIBERTY MUTUAL (CL)' = t1.current_owner_fn THEN 'N'
WHEN 'CLAIMS INTAKE - LIBERTY MUTUAL (CL) SUPPORT' = t1.current_owner_fn THEN 'N'
WHEN 'GENERAL AM INBOX - LIBERTY MUTUAL (CL)' = t1.current_owner_fn THEN 'N'
WHEN 'LIBERTY MUTUAL COMMERCIAL SUBRO' = t1.current_owner_fn THEN 'N'
WHEN 'LIBERTY MUTUAL INS - COMMERCIAL CLAIMS' = t1.current_owner_fn THEN 'N'
ELSE 'Y'
END

[SASJedi]

Your case expression has no logical expression. It should look something like this:

proc sql;
select distinct 
       Make
      , CASE (/* Logical Expression */ Type )
          WHEN 'SUV' THEN 'N'
          ELSE 'Y'
        END
   from sashelp.cars
;
quit;

or like this:

proc sql;
select distinct 
       Make
      ,CASE 
         WHEN (type='SUV') THEN 'N'
         ELSE 'Y'
       END
   from sashelp.cars;
quit;
 e