Oracle Database Discussions

Hi,
First of all, i've read in documentation that:

DROP ANY PROCEDURE Allows execution of DROP FUNCTION, DROP PACKAGE & DROP PROCEDURE commands in any schema.

Ok, i have: audit drop any procedure by roger by access;
i connect with roger, i create a FUNCTION, then i drop it. But in dba_audit_object i see only the create function action, the DROP function isn't audited. I want to know why..

Thanks