It's probably because the ejb-ref has no type information. It's needs some to know whether
the client dependency is for a 2.x or 3.0 view. Try adding <local-home> and <local>.
<ejb-ref>
<ejb-ref-name>ejb/EscalationPlanManager</ejb-ref-name>
<local-home>de.quipsy.sessions.escalationplanmanager.EscalationPlanManagerHome</local-home>
<local>e.quipsy.sessions.escalationplanmanager.?</local>
</ejb-ref>
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