We currently have ejb3-deployers-jboss-beans.xml in ejb3-core as well as in the AS/ejb3 module. Both these files have the same contents and just add to maintaining issues. The file actually has a combination of deployers (and other MC bean configs), some of which reside in AS and some in EJB3 project. Once the remaining deployers in AS/ejb3 have been migrated to EJB3 project as part of EJBTHREE-1538, the ejb3-deployers-jboss-beans.xml in AS/ejb3 will no longer be required. Until then the files in both these locations should not duplicate the deployer/MC bean configs. The one in ejb3-core should contain only those configs which reside in EJB3 project and the one in AS/ejb3 should contain the configs for AS/ejb3 deployers.

More related discussion can be found in referenced forum thread.