Annotation @Alternative does not work properly in EJB

Issue

I am using @Alternative annotation for testing purposes and it doesn't working properly. The default implementation is always injected:

• Interface

public interface MyService

• Default implementation

public class DefaultServiceImpl implements MyService 

• Alternative implementation

@Alternative
public class AlternativeServiceImpl implements MyService

• Stateless EJB

@Stateless
public class MyBO {
    @Inject
    private MyServcie myService
    ...
}

• beans.xml

<beans 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/beans_1_0.xsd">
    <alternatives>
        <class>xxx.AlternativeServiceImpl</class>
    </alternatives>
</beans>