Hi Flavia, the AOP version was specified in my mesage, it's 2.1.6.GA_CP01. We could not use the latest version of JBoss AOP with JBoss EAP 5.0 or 5.1 due to some libraries incompatibilites. Plus replacing component versions in EAP release is not officially supported.
Can you please tell us which version worked for you and if possible started from which version lightweight aspects become functional inside the container.
Thanks again for your help,
Andrew