Ah. OK. I didn't set this value in persistence.xml.
What does this property do? I try to explain it for my own: In persistence.xml 
I'm setting up how to connect the database. Whit the property you mentioned I 
give it a JNDI name?!? And this JNDI name is the value that is needed by the 
SelectItemsConfig. Right?

BTW: I just use the annotation @PersistenceContext(name="aresDatabase") to 
inject the EntityManager in each component that needs the EntityManager. I saw 
some guys using only the @In annotation. Why does it work for them? Does it 
have to do with the org.jboss.seam.core.ManagedPersistenceContext property in 
components.xml?

Where do I find more to read on this topic?

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