I've read that post and while excellent in it's own right, it only explains the differences in the two. Being new to EJB and and CMP, it's still unclear as to why you would mix the two types of persistence management within one application. I don't understand the advantage of using EXTENDED in a bean and then TRANSACTION in the next bean and what design and architectural aspect feed the decision. Thanks. Eric Ray View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964969#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...