Hibernate version:3.1

Full stack trace of any exception that occurs:SQLGrammarException: Colud not load an entity (BeanMessaggio#1)

Name and version of the database you are using:MySql 4.1

The generated SQL (show_sql=true):Errore nella query: org.hibernate.exception.SQLGrammarException: could not load an entity: [it.publisys.gestionecommesse.modello.BeanMessaggio#1]



I have two bean: BeanMessaggio and BeanRichiestaIntervento.

BeanMessaggio:
<?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="it.publisys.gestionecommesse.modello.BeanMessaggio"
table="messaggio" >
<id column="id" name="id" type="integer">
<generator class="native"/>
</id>
<one-to-one name="beanRichiestaIntervento" class="it.publisys.gestionecommesse.modello.BeanRichiestaIntervento" property-ref="beanMessaggio" />
<one-to-one name="beanRispostaIntervento" class="it.publisys.gestionecommesse.modello.BeanRispostaIntervento" property-ref="beanMessaggio" />
<!--one-to-one name="beanRichiestaFattibilita" class="it.publisys.gestionecommesse.modello.BeanRichiestaFattibilita" property-ref="beanMessaggio" /-->
<!--one-to-one name="beanRispostaFattibilita" class="it.publisys.gestionecommesse.modello.BeanRispostaFattibilita" property-ref="beanMessaggio" />
<one-to-one name="beanIntervento" class="it.publisys.gestionecommesse.modello.BeanIntervento" property-ref="beanMessaggio"/-->

</class>
</hibernate-mapping>


BeanRichiestaIntervento:

<?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="it.publisys.gestionecommesse.modello.BeanRichiestaIntervento" table="richiestaintervento" >

<id column="id" name="id" type="integer">
<generator class="native"/>
</id>
<property name="descrizioneRichiesta" column="descrizioneRichiesta" type="string" />
<property name="oggettoRichiesta" column="oggettoRichiesta" type="string" />
<property name="inviata" column="inviata" type="boolean" />
<property name="dataRichiesta" column="dataRichiesta" type="date" />
<many-to-one name="beanMessaggio" class="it.publisys.gestionecommesse.modello.BeanMessaggio" column="idMessaggio" unique ="true"/>
<!--one-to-one name="beanMessaggio" class="it.publisys.gestionecommesse.modello.BeanMessaggio" property-ref="beanRichiestaIntervento" /-->
<many-to-one name="beanUtente" class="it.publisys.gestionecommesse.modello.BeanUtente" column="idUtente" unique ="true"/>
</class>
</hibernate-mapping>


When in BeanMessagio there are two one-to-one association the load of the BeanMessagio give me follow error: org.hibernate.exception.SQLGrammarException: could not load an entity: [it.publisys.gestionecommesse.modello.BeanMessaggio#1].
Why?