If one has two -service.xml files with the same filename in different locations in the ear, there will only ever be one respective ServiceModule in the J2EE Management.
The reason for this is that there is no scope defined in the name, hence the filename has to be server-wide unique.

A ServiceModule should have a parent module like the EjbModule, which should make it possible to:

• have the same file name multiple times
• on the Server
• in one Application
• link the ServiceModule to the Application it belongs to.

Forum Topic: http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3862704#3862704