Application deployments may contain persistence units that have:

<property name="jboss.as.jpa.classtransformer" value="false" /> 

Or

<property name="jboss.as.jpa.classtransformer" value="true" /> 

But if applications have a mix of some persistence units with "jboss.as.jpa.classtransformer" set to false and some set to true, log a warning about the mix of enhanced + un-enhanced persistence units.