Java – WebSphere 7. Inject EJB from another application

I am trying to inject an EJB with the @EJB annotation:

• when I inject an EJB into another EJB in the same ear it works fine.
• when I inject an EJB into another EJB from another ear in the same
  server I get an exception:

EJB threw an unexpected (non-declared) exception during invocation of
method "sayHello". Exception data: javax.ejb.EJBException: Injection
failure; nested exception is:
com.ibm.ejs.container.EJBNotFoundException: EJB with interface
com.mycompany.myapp.ejb.test2 not present in application myapp1

I'm using WebSphere 7 and EJB 3.0. When I'm doing a jndi lookup myself, it works fine. How do I let the container know from where to inject my remote beans?

myapp1.ear contains the following : myapp1.jar (where the EJB is)

myapp1 EJB :

package com.mycompany.myapp1.ejb.test1;

@Remote
public interface HelloEjb1 { 
    public String sayHello();
}

EJB Impl :

package com.mycompany.myapp.ejb.test1;

@Stateless
public class HelloEjbImpl1 implements HelloEjb1 {

    @EJB
 HelloEjb2 helloEjb2;

    @Override
    public String sayHello() {
        return HelloEjb2.sayHello();
    }
}

myapp2.ear contains the following : myapp2.jar (where the EJB is)

myapp2 EJB :

package com.mycompany.myapp2.ejb.test2;

@Remote
public interface HelloEjb2 { 
    public String sayHello();
}

EJB Impl :

package com.mycompany.myapp2.ejb.test2;

@Stateless
public class HelloEjbImpl2 implements HelloEjb2 {

    @Override
    public String sayHello() {
        return "Hello";
    }
}