How to specify a user with EJBs

Hello.
I'm designing an integration system where I have to use EJBs. The problem I have is I need to specify a user when the client invokes an stateless session bean on the application server. I need it because the application the client calls, uses the ejb user id.
This is how the application (JBOSS jBPM) gets the actor Id.
Principal p = ejbSessionContext.getCallerPrincipal();
actorId = ( p!=null ? p.getName() : "unauthenticated-ejb-client" );
I get the unauthenticated-ejb-client because I have not especified any actor.
Could anyone explain me how to set the ejb user or actor.
Thank you in advance.
Regards

Here is the code I use to invoque the EJB:
            Properties properties = new Properties();
            properties.put( Context.INITIAL_CONTEXT_FACTORY       ,"org.jnp.interfaces.NamingContextFactory");
            properties.put( Context.PROVIDER_URL,"localhost:1099");
            properties.put( Context.URL_PKG_PREFIXES,"jboss.naming:org.jnp.interfaces");
            JbpmEjbServiceLocator jbpmEjbServiceLocator = new JbpmEjbServiceLocator( properties );
            ExecutionServiceRemote executionServiceRemote = null;
            executionServiceRemote = jbpmEjbServiceLocator.getExecutionServiceRemote();            then I get an ExecutionServiceRemote that is the door to the application API.
There is no way to especify in the invocation the actor Id. It must be set with the authentication of the EJB.
Thank your your help.

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Hi,
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The signature of the procedure is below. See the highlighted lines.
procedure create_fnd_user (-- Description:
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-- p_person_type "E" marks the user as external
-->
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