in cell editing an object with select menu not updated - spring

Question

i'm having trouble updating an object in a datatable even thow it works just fine with other objects using incell edeting:
i have an object called Audit wich includes an object Statu and an object utilisateur like this
private int id;
private Statu statu;
private Utilisateur utilisateur;
private OrganismeAudite organismeAudite;
private String date;
private String personneRencontre;
in the datatable i do :
<p:dataTable var="car" value="#{AuditBean.listAudit}" id="carList" editable="true">
<p:ajax event="rowEdit" update="#this"
listener="#{AuditBean.rowEditListener}" />
<f:facet name="header">
Modification
</f:facet>
<p:column headerText="ID" style="width:125px">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{car.id}" />
</f:facet>
<f:facet name="input">
<p:inputText value="#{car.id}" style="width:100%" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Date" style="width:125px">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{car.date}" />
</f:facet>
<f:facet name="input">
<p:inputText value="#{car.date}" style="width:100%" label="Year" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Personne Rencontre" style="width:125px">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{car.personneRencontre}" />
</f:facet>
<f:facet name="input">
<h:inputText value="#{car.personneRencontre}" />
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Responsable Audit">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{car.utilisateur.nom}" />
</f:facet>
<f:facet name="input">
<p:selectOneMenu id="idUtilisateur" value="#{car.utilisateur.idutilisateur}">
<f:selectItems value="#{UtilisateurBean.listUtilsa}"
var="utilisateur" itemLabel="#{car.utilisateur.nom}"
itemValue="#{car.utilisateur.idutilisateur}" />
</p:selectOneMenu>
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Statut Audit" style="width:125px">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{car.statu.libelle}" />
</f:facet>
<f:facet name="input">
<p:selectOneMenu id="idStatut" value="#{car.statu.id}">
<f:selectItems var="statu" value="#{StatusBeane.listSta}"
itemLabel="#{car.statu.libelle}"
itemValue="#{car.statu.id}" />
</p:selectOneMenu>
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Organisme Audité" style="width:125px">
<p:cellEditor>
<f:facet name="output">
<h:outputText value="#{car.organismeAudite.nom}" />
</f:facet>
<f:facet name="input">
<p:selectOneMenu id="idOrganisme" value="#{AuditBean.idOrganisme}">
<f:selectItems var="orgStA" value="#{OrganismeAuditeBean.listOrga}" />
</p:selectOneMenu>
</f:facet>
</p:cellEditor>
</p:column>
<p:column headerText="Options" style="width:50px">
<p:rowEditor />
</p:column>
</p:dataTable>
the responsable audit column is updated just fine but it doesn't work in the statu audit column. They'r both a one to many relation (i'm using hibernate and spring ioc)
int the bean the rowlistener goes like this :
public void rowEditListener(RowEditEvent ev) {
try {
Audit userEdit = (Audit) ev.getObject();
Utilisateur u= new Utilisateur();
Statu sta=new Statu();
System.out.println(userEdit.getStatu().getId());
// getUserEJB().save(userEdit);
System.out.println(userEdit.getDate() + " - " + userEdit.getId()+" - "+userEdit.getUtilisateur().getIdutilisateur()+" - "+userEdit.getStatu().getLibelle());
resp.update(userEdit);
} catch (Exception e) {
e.printStackTrace();
}
}
now whene i choose a statu the userEdit.getStatu().getLibelle() shows me the original statu not the one that i have chosen from the list, but if i click on the check incon it only saves one value every time wich is the seconde element(statu)!!!!!!!!!!!!!!!!!
i don't know what i'm doing wrong
thanks in advance :)