<bag
            name="publicPhoneNumbers"
            table="EMPLOYEE_PHONE_NUMBERS"
            lazy="true"
            update="false"        ------------------------  why i cannot use
            insert="false"          ------------------------  these two
            order-by="id"
            cascade="none">
            <key>
                <column name="EMPLOYEE" not-null="true"/>
            </key>
            <one-to-many class="com.mycompany.domain.PhoneNumber"/>
        </bag>