Yes you are right. See 
http://java.sun.com/javaee/javaserverfaces/1.1_01/docs/api/javax/faces/component/UISelectOne.html
 for example.

I hadn't come across it as I always override the equals methods of entities to 
compare on id equality (if the object is set, otherwise fallback on object 
equality). 

A drawback the EntityConverter for which I can see no work around (you get the 
Entities from two different EntityManager instances [1]). So, you could either 
add an equals method (as on the example ClientType) or you could look at the 
alternive index or String strategies.  Or wait for someone to come up with a 
@SelectItemsSelection annotation.

[1] I couldn't get them from the SeamManaged Persistence Context as it caused 
entities to become detached when using Container Managed Transactions.

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