<?xml version="1.0" encoding="UTF-8"?>
<hibernate-mapping
    xmlns="urn:nhibernate-mapping-2.2"
    default-cascade="none">

    <class
        name="...."
        table="ABONNEMENT"
        dynamic-insert="false"
        dynamic-update="false"
        lazy="true">

        <cache usage="read-write" />
        <id name="Id" type="Int64" unsaved-value="0">
            <column name="ID" sql-type="BIGINT"/>
            <generator class="native">
            </generator>
        </id>

   ........

        <many-to-one name="Commande" class="Fr.Cned.AtoutCned.Dispositif.Entites.Collectivites.BonDeCommande, Fr.Cned.AtoutCned.Dispositif.Core" outer-join="auto" cascade="none" foreign-key="ABONNEMENT_COMMANDE_FKC">
            <column name="COMMANDE_FK" not-null="false" sql-type="VARCHAR(255)"/>
        </many-to-one>

        .......

    </class>

</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<hibernate-mapping
    xmlns="urn:nhibernate-mapping-2.2"
    default-cascade="none">

    <class
        name="..."
        table="BON_DE_COMMANDE"
        dynamic-insert="false"
        dynamic-update="false"
        lazy="true">

        <cache usage="read-write" />
        <id name="Numero" type="String" unsaved-value="null">
            <column name="NUMERO" sql-type="VARCHAR(255)"/>
            <generator class="assigned">
            </generator>
        </id>

        <set name="Abonnements" order-by="COMMANDE_FK" lazy="true" outer-join="auto" inverse="true" cascade="delete">
            <cache usage="read-write" />
            <key foreign-key="ABONNEMENT_COMMANDE_FKC">
                <column name="COMMANDE_FK" sql-type="VARCHAR(255)"/>
            </key>
            <one-to-many class="Abonnement"/>
        </set>
....

    </class>
    <!-- NHibernate.hbm.xml.vsl merge-point -->
</hibernate-mapping>