Security checks for EJB3 entity beans are performed with an EntityListener. You can install this listener by using the following META-INF/orm.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm 
		 http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"
                 version="1.0">
                 
    <persistence-unit-metadata>
        <persistence-unit-defaults>
            <entity-listeners>
                <entity-listener class="org.jboss.seam.security.EntitySecurityListener"/>
            </entity-listeners>
        </persistence-unit-defaults>
    </persistence-unit-metadata>
    
</entity-mappings>