I am not too familiar with the SpringBeanAutowiringInterceptor, but I assume you have read http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/ejb/interceptor/SpringBeanAutowiringInterceptor.html.
Since since you are using Spring 2.5, try using @Qualifier so you would have the following configuration :
@Autowire
@Qualifier("servicio")
private DummyService servicio
and in your application context ...
<bean id="servicio" class="mx.com.tattvait.cyf.service.modulo.impl.DummyServiceImpl"/>