Due to a bug in Axis2, it seems that if one configure a SU to engage a specific module such as rampart (note: addressing is engaged globally by design, axis2 imposes it, and is disabled by service as needed), then it is actually used by all the services deployed on the component and not only for the given SU.
This is caused by the following bug from Axis2: https://issues.apache.org/jira/browse/AXIS2-5721
It is too complex to be worked around in Petals: at worst, service invocation may be a little bit slower, but normally there won't be any problem.
We should wait for the bug to be fixed by upstream.
Bug
Open
Major