DECLARE 
	the_text VARCHAR2(80) := 'A text with here '||chr(10)||'a line feed'; 
	al_id ALERT; 
	al_button Number; 
BEGIN 
	al_id := FIND_ALERT('MY_ALERT'); 
	SET_ALERT_PROPERTY(al_id, alert_message_text, the_text); 
	al_button := SHOW_ALERT( al_id ); 
END;