Cannot put EJB in a separate jar

I have an EJB with some JPA logic that I use in my java EE projects. Instead of copying the class in every project I'm trying to put it in a separate jar, so I have this structure:

• Java EE project with EJB and WAR projects in it
• JPALogic: JAR project with JPALogic class in it
• RemoteServices: JAR project with beans interfaces
• Services: EJB project with beans, including JPALogic and RemoteServices as libraries
• Frontend: WAR project with frontend, including RemoteServices as library.

JPALogic is used only in the EJB project and there's no reference to it in other parts of the Java EE app. In JPALogic library I've my JPALogic bean:

@Stateless
@LocalBean
public class JPALogic {
  @Resource
  private EJBContext ejbContext;
  @Inject @ShardedPersistenceContext
  private EntityManager em;
  public JPALogic() {
  }
  [...lots of methods...]
}

It works perfect if JPALogic code is directly in the EJB project, but when I put it in the external library deployment become very unstable (netbeans 8 + glassfish 4) and almost every deploy fail with this error:

Exception while deploying the app [app] : Cannot resolve reference [Remote ejb-ref name=com.my.autenticacion.services.AutRolBackendServices/jpa,Remote 3.x interface =com.my.infraestructura.jpa.JPALogic,ejb-link=null,lookup=,mappedName=,jndi-name=,refType=Session] because there are [2] ejbs in the application with interface com.my.infraestructura.jpa.JPALogic. 

I've search but it seems this kind of error appear when an interface have more than one implementation, and this is not the case: there's only one bean named "JPALogic" and, inspecting the ear, JPALogic.jar appear one time only.

I'm doing something wrong?