This is the configuration file used in SAP PI Adapter Module - EJB Project. This configuration works for EJB 1.4 and PI 7.1 and greater

ejb-jar.xml

<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" id="ejb-jar_ID" version="2.1" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/ejb-jar_2_1.xsd">
	<display-name>{name of your EJB}</display-name>
    <enterprise-beans>
        <session>
            <icon/>
            <ejb-name>{name of your EJB}</ejb-name>
            <home>com.sap.aii.af.lib.mp.module.ModuleHome</home>
            <remote>com.sap.aii.af.lib.mp.module.ModuleRemote</remote>
            <local-home>com.sap.aii.af.lib.mp.module.ModuleLocalHome</local-home>
            <local>com.sap.aii.af.lib.mp.module.ModuleLocal</local>
            <ejb-class>com.sap.adaptermodule.{name of your EJB Bean}</ejb-class>
            <session-type>Stateless</session-type>
            <transaction-type>Container</transaction-type>
        </session>
    </enterprise-beans>
</ejb-jar>