If you are using @In then you need to configure JPA 
http://docs.jboss.com/seam/1.2.1.GA/reference/en/html/persistence.html#d0e5419
It means that seam will manage your EntityManager and you will just inject it.
Benefit of that is that you actualy use one EntityManager in side conversation, 
it is a great thing if you need to span one "hiberante session" between many 
actionBeans beacuse you than you do not have to merge things in side your 
context when you whant to persist them and so on it is truly session per 
conversation pattern, great thing I love it.
On the other hand if you use @PersistenceContext than it is EJB stuff and and 
EntityManager is unique for on ActionBean only.
I was confused about that to maybe this van help also 
http://www.jboss.com/index.html?module=bb&op=viewtopic&t=106004

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