Entity Bean's Local interface with weblogic 6.0

Hi All,
I am trying to work on new feature of EJB 2.0. i.e. Local interfaces.
I have written the Entity Bean (CMP) that has Local intereface.
the declaration is as follows:
"public interface LocalAddress extends EJBLocalObject"
Now when I complie the error I get is:
"
LocalAddress.java:12: cannot resolve symbol
symbol : class EJBLocalObject
location: package ejb
import javax.ejb.EJBLocalObject;
"
I have ejb20.jar file installed and it is there in the classpath. I have checked the class in weblogic.jar file(weblogic 6.0). Its not there. Howerver these local class files are there in the weblogic.jar file of weblogic 6.1.
Also the weblogic (6.0) documentation do not say that this feature is not supported in weblogic 6.0.
Is any body worked on local interfaces for entity beans on weblogic 6.0? If yes, Pl. share your experiance.
Thanks in Advance,
Nabha