Function Return scalar

Hi,

  I can't create a function to return a single value ?

  In reference http://help.sap.com/hana/html/sql_create_function.html say that i can use Return <sql_type> or <table type>.

  But I can't create a function to return a single sql_type. Like this:

CREATE FUNCTION teste123(a varchar(10)) RETURNS INTEGER 

LANGUAGE SQLSCRIPT AS

BEGIN

return 10;

END;

Thank you.