How to call PLSQL Function in Condition tab of form personalization

Hi,

  I created the PLSQL function like this.

create or replace function test_func(param IN Date) return varchar2 is

ret_value varchar2(100);

begin

ret_value := to_char(TO_DATE( param , 'dd-mm-yyyy'),'Day');

return (ret_value);

end;

I would like to call this PLSQL function in Condition tab of form personalization.

May I know solution for this requirement

Best Regards,

Htet Htet