p:dataScroller works only for the last element - primefaces

Question

I am trying to use dataScroller to show elements of a database table. It shows all the elements correctly but when I try to use some actions it only works for the last element like:
<p:commandButton value="vote"
action="#{avisBean.updateAvis(in,email)}">
and
<p:commandButton value="commenter" icon="ui-icon-check"
action="#{avisBean.addAvis(in,email)}">`
and for the others nothings enters to the database just empty string. How can I correct this?
This is the code:
<h:form id="commandLink">
<p:dataScroller value="#{ideeBean.idees}" var="in" chunkSize="10"
mode="inline" scrollHeight="500">
<f:facet name="header">
Les Idées
</f:facet>
<h:panelGrid columns="1" style="width:100%"
columnClasses="logo,detail">
<!-- <p:graphicImage name="demo/images/car/#{car.brand}-big.gif" /> -->
<p:outputPanel>
<h:panelGrid columns="2" cellpadding="5">
<h:outputText value="#{msg['idee.titre']}" />
<h:outputText value="#{in.titre}" style="font-weight: bold" />
<h:outputText value="#{msg['idee.description']}" />
<h:outputText value="#{in.description}"
style="font-weight: bold" />
<h:outputText value="#{msg['idee.theme']}" />
<h:outputText value="#{in.theme}" style="font-weight: bold" />
<h:outputText value="#{msg['idee.type']}" />
<h:outputText value="#{in.type}" style="font-weight: bold" />
<!-- *******************Rating**************** -->
</h:panelGrid>
</p:outputPanel>
<h:panelGrid columns="4" cellpadding="5">
<p:commandButton value="details"
action="details?faces-redirect=true"
actionListener="#{ideeBean.attrListener}">
<f:attribute name="idee" value="#{in}" />
</p:commandButton>
<!--************************************** -->
<p:selectOneMenu id="console" value="#{avisBean.avis.score}"
style="width:125px" converter="javax.faces.Integer">
<f:convertNumber integerOnly="true" />
<f:selectItem itemLabel="Choisir" itemValue="" />
<f:selectItem itemLabel="Horrible" itemValue="1" />
<f:selectItem itemLabel="médiocre" itemValue="2" />
<f:selectItem itemLabel="Bon" itemValue="3" />
<f:selectItem itemLabel="Trés Bon" itemValue="4" />
<f:selectItem itemLabel="Excellent" itemValue="5" />
</p:selectOneMenu>
<p:commandButton value="vote"
action="#{avisBean.updateAvis(in,email)}">
</p:commandButton>
</h:panelGrid>
<!-- ***************************comments******************** -->
<p:dataScroller id="growl"
value="#{ideeBean.getAllAvisList(in.id)}" var="a" chunkSize="2">
<f:facet name="header">
commentaires
</f:facet>
<f:facet name="loader">
<p:commandButton type="button" value="Plus"
icon="ui-icon-circle-triangle-s" />
</f:facet>
<h:panelGrid columns="1">
<!-- <p:graphicImage name="demo/images/car/#{car.brand}-big.gif" /> -->
<p:outputPanel>
<h:panelGrid columns="4" cellpadding="5">
<h:outputText value="#{a.user_avis.nom}" />
<p:inplace id="ajax" editor="true">
<p:ajax event="save" listener="#{avisBean.updateAvis(a)}" />
<h:inputText value="#{a.commentaire}"
style="font-weight: bold" rendered="#{not empty a.commentaire}" />
</p:inplace>
<p:commandButton value="Supprimer"
action="#{ideeBean.deleteAvisById(in.id,a.id)}"
icon="ui-icon-arrowrefresh-1-w"
rendered="#{utilisateurBean.getAllAvis(a,userid)}">
<f:param name="userid" value="#{loginBean.id}"></f:param>
</p:commandButton>
</h:panelGrid>
</p:outputPanel>
</h:panelGrid>
</p:dataScroller>
<!-- ***************************************** -->
<h:panelGrid columns="1">
<p:inputTextarea rows="2" cols="50" id="comment"
value="#{avisBean.avis.commentaire}" />
<p:commandButton value="commenter" icon="ui-icon-check"
action="#{avisBean.addAvis(in,email)}">
<f:param name="email" value="#{loginBean.email}"></f:param>
</p:commandButton>
</h:panelGrid>
<h:panelGrid columns="1" style="width:100%">
<p:graphicImage value="resources/images/separateurr.png" />
</h:panelGrid>
</h:panelGrid>
</p:dataScroller>
</h:form>