JAXB-ElipseLink: Preventing marshalling of inherited property

Question

Again i am having an EclipseLink 2.3 marshalling-usecase that seems to be quite trivial but not working as expected:

I have an abstract base class which defines a property getX(). I have several child-classes derived from this base-class that inherit this property.

On marshalling the child-classes this property is marshalled as well for every child-class. However, for one specific child-class i want to prevent marshalling of this property.

I tried:

1. @Override this property in the child-class and setting it @XmlTransient
2. Specifying <xml-transient java-property="X"> in the oxm.xml for the child-class.

Both to no avail, the property is always marshalled - how is this supposed to work?