SQL & PL/SQL

Hi, i'm new in oracle programming and i have a problem with my query in oracle reports
the code is something like this

function CF_ITEMFormula return number is
v_item number(30);
begin
 IF :P_state <> ALL then
        IF :P_STATE = 'SMALL' THEN
        SELECT aa.item
        INTO v_item
        FROM tableA aa,
                 tableb bb
        WHERE aa.code = bb.code
        AND aa.date = :P_date
        AND aa.name = :P_name
        AND bb.state LIKE '%et%''
        AND (case :P_DIV
                when ('west') then aa.division = 1
                when ('east') then aa.division = 2
                when ('south') then aa.division = 3
                when ('south & west) then aa.division in (1,3)
                else aa.division in (1,2,3)
                end);
        end if;
       IF :P_STATE = 'BIG' THEN
        SELECT aa.item
        INTO v_item
        FROM tableA aa,
                 tableb bb
        WHERE aa.code = bb.code
        AND aa.date = :P_date
        AND aa.name = :P_name
        AND bb.state LIKE '%wa%''
        AND (case :P_DIV
                when ('west') then aa.division = 1
                when ('east') then aa.division = 2
                when ('south') then aa.division = 3
                when ('south & west) then aa.division in (1,3)
                else aa.division in (1,2,3)
                end);
        end if;
end if;
EXCEPTION
WHEN NULL THEN RETURN (0)
end;

when i complied it, it didn't produce error but when i executed the report a pop up massages showed fatal error in pl/sql CF_ITEMFormula
so would someone help me to correct this query

thanks

Hendra