I am not familiar with BEA's custom data transfer feature. From the brief look I took at the document, it seems to rely on mechanisms proprietary to BEA and outside of WSRP's scope. It's therefore no surprise that it wouldn't work with a non-BEA producer such as JBoss Portal. I suspect that the extra data is passed as extensions in the WS messages, though I cannot tell for sure that this is the case. You might be able to do something similar using a standard JAX-RPC Handler to achieve the result you desire. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4144061#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...