Org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned

Assuntos Gerais
#1

Boa noite!

Como colocar o generator Native em uma composite?
grato

segue meu hbm

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping default-lazy="false">
    <class name="br.com.estudo.model.UsuarioAluno" table="UsuarioAluno" >
        <composite-id name="id" class="br.com.estudo.model.UsuarioAlunoId">
            <key-property name="usuarioId" type="java.lang.Long">
                <column name="usuarioId" />
            </key-property>
            <key-property name="alunoID" type="java.lang.Long">
                <column name="alunoID" />
            </key-property>
        </composite-id>
        <many-to-one name="aluno" class="br.com.estudo.model.Aluno" update="false" insert="false" fetch="select">
            <column name="PartnerID" not-null="true" />
        </many-to-one>
        <many-to-one name="usuario"  class="br.com.estudo.model.User" update="false" insert="false" fetch="select">
            <column name="UserID" not-null="true" />
        </many-to-one>
        <property name="qqcoisa" type="boolean">
            <column name="qqcoisa" not-null="true" />
        </property>
    </class>
</hibernate-mapping>

grato
abs

#2

Alguém ?

#3