Multicast for Distributed Topic

When I enter a value in the Multicast address for a Distributed topic,
when I start the server I get:

element not allowed forwarding-policy

it seems that the SystemModule-0-jms.xml generated by the console does not comply with the official schema, for the element uniform-distributed-topic doesn't seem to accept "multicast" after forwarding-policy.

Changing the configuration with WLST doesn't fix the problem.

Schemas are in C:\pierre\bea1035\wlserver_10.3\server\lib\schema\weblogic-domain-binding.jar under META-INF/schema*.xsd
but I could not locate the definition of uniform-distributed-topic

ok 2 hours wasted and no progress...

Anyway they say that multicast doesn't guarantee delivery, so it's not going to be adopted in a Exactly-once QOS scenario...