Injection metadata in ejb-jar.xml does not override @EJB annotation

I have 2 stateless session EJBs, RecipientServiceBean and InjectedServiceBean.

RecipientService exposes a remote interface. InjectedService exposes only a local interface and is injected into the 'injectedService' field of the RecipientServiceBean

--------------------------------------------------- RecipientServiceBean ---------------------------------------------------
@Stateless(name="RecipientServiceBean")
@Remote(RecipientService.class)
public class RecipientServiceBean implements RecipientService {

@EJB(mappedName="overrideinjection/InjectedServiceBean/local")
private InjectedService injectedService;

public String saySomething()

{ return "Hello: " + injectedService.getResponse(); }

}
--------------------------------------------------- InjectedServiceBean ---------------------------------------------------
@Stateless(name="InjectedServiceBean")
@Local(InjectedService.class)
public class InjectedServiceBean implements InjectedService {

public String getResponse()

{ return "This is the real service"; }

}
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I now want to override the injection specified by the @EJB annotation to inject a stub service. The stub service and ejb-jar.xml included is as follows
--------------------------------------------------- RecipientServiceStubBean ---------------------------------------------------
public class InjectedServiceStubBean implements InjectedService {

public String getResponse()

{ return "THIS IS THE STUB"; }

}

--------------------------------------------------- ejb-jar.xml ---------------------------------------------------
<?xml version="1.0" encoding="ISO-8859-1"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
version="3.0">

<enterprise-beans>
<session>
<ejb-name>RecipientServiceBean</ejb-name>
<remote>com.sadalbari.test.overrideinjection.RecipientService</remote>
<ejb-class>com.sadalbari.test.overrideinjection.impl.RecipientServiceBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>

<ejb-local-ref>
<ejb-ref-name>ejb/InjectedService</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local>com.sadalbari.test.overrideinjection.InjectedService</local>
<ejb-link>InjectedServiceStubBean</ejb-link>
<injection-target>
<injection-target-class>com.sadalbari.test.overrideinjection.impl.RecipientServiceBean</injection-target-class>
<injection-target-name>injectedService</injection-target-name>
</injection-target>
</ejb-local-ref>

</session>

<session>
<ejb-name>InjectedServiceStubBean</ejb-name>
<local>com.sadalbari.test.overrideinjection.InjectedService</local>
<ejb-class>com.sadalbari.test.overrideinjection.impl.InjectedServiceStubBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>

</enterprise-beans>

</ejb-jar>
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A dump of my JNDI view at this point

+- overrideinjection (class: org.jnp.interfaces.NamingContext)

---------------------------------------------------------------------------------------------------------------------------------------------------------

The result is that the injection is not overridden and the stub is not used in preference to the 'real service':

Hello: This is the real service

I can work around this issue by removing the @EJB annotation and ALWAYS declaring the injection in the ejb-jar.xml in which case I get:

Hello: THIS IS THE STUB

Thanks
Justin