Why jar-file tag does not find entities in JBoss EAP?

Issue

After a migration of an application from JBoss 4.2.3.GA to JBoss EAP 6.1.1, and the tag jar-file in persistence.xml file does not identify the entities. Below the EAR structure:

app-ear.ear
app-framework1.jar
app-framework2.jar
app-web.war
app-framework3.jar
jboss-seam.jar
lib
META-INF
jboss-deployment-structure
persistence.jar
persistence.xml

persistence.xml

<persistence xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"><!-- persistence-unit name="grpfor">
...
<jar-file>../grpfor-framework.jar</jar-file>
<jar-file>../grpforfc-framework.jar</jar-file>
<jar-file>../grpforfc-orc.jar</jar-file>
...