seam-faces: tx.begin(); throws "Nested transaction not supported"

[rocketman.s.wingels.gmx.de]

Hi Seamers,

within my POM I have a dependency to org.jboss.seam.faces - 3.0.0.Final.

Now tx.begin(); throws javax.faces.FacesException: #{...}: javax.transaction.NotSupportedException: Nested transaction not supported.

When removing seam.faces from my project, persisting works fine.

@Inject
private UserTransaction tx;
//...
tx.begin();
em.persist(myObject);

Am I not able to use UserTransaction with seam.faces?

Thanks, Sascha