exception is thrown by javax.ejb.EJBLocalObject.isIdentical -- ejb2.x

I am new to JBoss community. If I don't report the issues correctly, pls help correct me.

I develop a stateless session bean, in which EJB2.x and EJB3 interfaces coexist.
In short, it works, but with two issues.

1. unable to override 2.x local home jndi name.
In jboss.xml (jboss_5_0.dtd), the local home jndi is NOT allowed, so you have to refer to the default local home jndi – beanName/local

2. when calling method on remote business interface, it works, but EJB exception is thrown by javax.ejb.EJBLocalObject.isIdentical.