<class name="com.tecnoy.itacsa.modelo.Orders" table="orders" catalog="itacsa" >
        <id name="intIdOrder" type="int">
            <column name="int_idOrder" />
            <generator class="identity" />
        </id>
        <many-to-one name="fleetCarrier" class="com.tecnoy.itacsa.modelo.FleetCarrier"  fetch="join" update="false" insert="false" >
            <column name="int_idCarrier" />
        </many-to-one>
        <many-to-one name="zoneLocations" class="com.tecnoy.itacsa.modelo.ZoneLocations" fetch="join" update="false" insert="false">
            <column name="int_idLocation" />
        </many-to-one>
        <many-to-one name="users" class="com.tecnoy.itacsa.modelo.Users" fetch="join" update="false" insert="false">
            <column name="int_idUser" />
        </many-to-one>
        <many-to-one name="ordersStatus" class="com.tecnoy.itacsa.modelo.OrdersStatus" fetch="join" update="false" insert="false">
            <column name="int_idOrdersStatus" />
        </many-to-one>
        <many-to-one name="fleetTruck" class="com.tecnoy.itacsa.modelo.FleetTruck" fetch="join" update="false" insert="false">
            <column name="int_idTruck" />
        </many-to-one>
        <many-to-one name="fleetDrivers" class="com.tecnoy.itacsa.modelo.FleetDrivers" fetch="join" update="false" insert="false">
            <column name="int_idDriver" />
        </many-to-one>
        <many-to-one name="merchanType" class="com.tecnoy.itacsa.modelo.MerchanType" fetch="join" update="false" insert="false" >
            <column name="int_idMercType" />
        </many-to-one>
        <property name="varOrderTrans" type="string">
            <column name="var_orderTrans" not-null="true" />
        </property>
        <property name="varDestiny" type="string">
            <column name="var_destiny" length="400" />
        </property>
        <property name="varNoteDelivery" type="string">
            <column name="var_noteDelivery" />
        </property>
        <property name="datDatePredictedDel" type="date">
            <column name="dat_datePredictedDel" length="10" />
        </property>
        <property name="datDateRec" type="date">
            <column name="dat_dateRec" length="10" />
        </property>
        <property name="datLastModified" type="date">
            <column name="dat_lastModified" length="10" />
        </property>
        <property name="datAlbaran" type="date">
            <column name="dat_albaran" length="10" />
        </property>
        <property name="varMercType" type="string">
            <column name="var_mercType" />
        </property>
        <set name="historyStatuses" inverse="true">
            <key>
                <column name="int_idOrder" not-null="true" />
            </key>
            <one-to-many class="com.tecnoy.itacsa.modelo.HistoryStatus" />
        </set>
    </class>

<hibernate-mapping>
    <class name="com.tecnoy.itacsa.modelo.MerchanType" table="merchan_type" catalog="itacsa" lazy="false">
        <id name="intIdMercType" type="java.lang.Integer">
            <column name="int_idMercType" />
            <generator class="identity" />
        </id>
        <property name="varMercTypeDescription" type="string">
            <column name="var_MercTypeDescription" length="100" not-null="true" />
        </property>
        <property name="booStatus" type="java.lang.Boolean">
            <column name="boo_status" />
        </property>
        <set name="orderses" inverse="true" >
            <key>
                <column name="int_idMercType" not-null="true" />
            </key>
            <one-to-many class="com.tecnoy.itacsa.modelo.Orders" />
        </set>
    </class>
</hibernate-mapping>

<filter>
      <filter-name>hibernateFilter</filter-name>
      <filter-class>
         org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
      </filter-class>
   </filter>
   <filter-mapping>
      <filter-name>hibernateFilter</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>
   <listener>
      <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
   </listener>

Hibernate: update itacsa.orders set var_orderTrans=?, var_destiny=?, var_noteDelivery=?, dat_datePredictedDel=?, dat_dateRec=?, dat_lastModified=?, dat_albaran=?, var_mercType=? where int_idOrder=?

18-02-10 14:14:53,288 ERROR [http-8084-1][JDBCExceptionReporter(78)]: Cannot add or update a child row: a foreign key constraint fails (`itacsa`.`orders`, CONSTRAINT `fk_idCarrier` FOREIGN KEY (`int_idCarrier`) REFERENCES `fleet_carrier` (`int_idCarrier`) ON DELETE NO ACTION ON UPDATE NO ACTION)
18-02-10 14:14:53,295 ERROR [http-8084-1][AbstractFlushingEventListener(301)]: Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update

org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: com.tecnoy.itacsa.modelo.MerchanType; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.tecnoy.itacsa.modelo.MerchanType

<s:form action="ordersFilter" theme="simple" cssClass="yform">
   <s:hidden name="order.users.intIdUser" id="order.users.intIdUser"
      value="" />
   <table>
      ...
         <td><s:label>Tipo de mercancía: </s:label></td>
         <td><s:select id="order.merchanType.intIdMercType"
            name="order.merchanType.intIdMercType"
            headerValue="--- Seleccione Tipo Mercancia ---" headerKey="0"
            list="listadoTipoMercancias" listKey="intIdMercType"
            listValue="varMercTypeDescription" /></td>
      ...
   </table>
</s:form>

public class Orders  implements java.io.Serializable {
   private static final long serialVersionUID = 1L;
   private Integer intIdOrder;
     private MerchanType merchanType;
     private Date datDateRec;
     private Date datLastModified;
     private Date datAlbaran;
     private String varMercType;
...

public void update(Orders order) {
      Orders persistent = orderDAO.loadById(order.getIntIdOrder());
      if (persistent != null) {
         try {
            BeanUtils.copyProperties(persistent, order);
            orderDAO.persist(persistent);
         } catch (IllegalAccessException e) {
            e.printStackTrace();
         } catch (InvocationTargetException e) {
            e.printStackTrace();
         }
      } else {
         orderDAO.persist(order);
      }