An ear file with modules in subfolders can not deploy under AS 7.0

I have an ear file names migrate.ear which contains one ejb jar (ejb.jar) and one war file (war.war), if I put the ejb jar to a ejb folder and war file to war folder, the ear can not be depoyed.

If I move the ejb jar and war file out, it can be deployed.
Below structuer can be deployed:
ejb.jar
lib/
lib/util-1.0-SNAPSHOT.jar
lib/version.jar
META-INF/
META-INF/application.xml
META-INF/MANIFEST.MF
war.war

Below structure can not be deployed:
ejb/
ejb/ejb.jar
lib/
lib/util-1.0-SNAPSHOT.jar
lib/version.jar
META-INF/
META-INF/application.xml
META-INF/MANIFEST.MF
war/
war/war.war

Below is the error:
http://community.jboss.org/message/630869#630869