So this is a JNDI lookup. Have you checked the JNDI list to see what the EJB is really named? (I know how to get the list of JNDI entries on earlier versions of JBoss AS - use the JNDIView mbean - but not on AS 7) Have you tried:
@EJB(lookup="java:module/de.h3llghost.data.DataAccessObject"