The class org/jboss/ws/extensions/wsrm/policy/RM10PolicyAssertionDeployer.java asserts the valid namespace for reliable messaging to be:

http://schemas.xmlsoap.org/ws/2005/02/rm

Per the spec at:

http://www.google.com/url?sa=t&source=web&ct=res&cd=1&url=http%3A%2F%2Fspecs.xmlsoap.org%2Fws%2F2005%2F02%2Frm%2FWS-RMPolicy.pdf&ei=5GiMScv9KqKBtwev0IWbCw&usg=AFQjCNHto8FjKO-LfzwO9nc3MJDc3of9Ow&sig2=cs6go9Ilu3dT9t5ilOADCw

As well as the metro documentation the valid namespace should be

http://schemas.xmlsoap.org/ws/2005/02/rm/policy

Note the addition of policy.