p:inputText in p:dataTable not setting the value in the bean - spring

Question

I'm trying to implement a dataTable which contains (among other things) a column with a textInput so I can modify a string value in the bean. My problem is that the bean does not update correctly, so this is part of my code:
<p:scrollPanel style="height:625px" mode="native">
<p:dataTable value="#{oaBean.documentos}" var="documento"
rowIndexVar="rowIndexVar" rowKeyVar="documentoKey" id="documentoList"
widgetVar="myTableWidget" paginator="true" rows="50"
emptyMessage="#{messages['norecords']}">
<f:facet name="header">
<h:outputText value="#{messages['documents']}" />
</f:facet>
<p:column style="width:1px;margin:0;padding:0;" headerText="#">
<h:outputText value="#{rowIndexVar+1}"
style="font-size:0.75em;margin:0;padding:0;" />
</p:column>
//lots of another columns
<p:column headerText="#{messages['documento.orden']}"
style="width:25px; text-align: center" id="columnOrden" widgetVar="columnOrden">
<p:inputText id="ordenDocumento" value="#{documento.orden}"
disabled="#{documento.eliminado}" style="font-size:0.9em" size="2"
validator="floatValidator">
</p:inputText>
</p:column>
</p:dataTable>
</p:scrollPanel>
The thing is that when the control returns to the bean the value of orden is not updated, I always have the old value. I've also tried adding an ajax listener for the change event and it seems to work fine, but if I change for example, 5 rows, at least one of them maintains the old value, so my question is: is there any known problem with dataTables and textInputs? Is something wrong with my code?
Any help will be really appreciated, thanks in advance guys.
UPDATE
Sorry, I've forgot to include some information. First of all, I'm working with Mojarra 2.1.5, PrimeFaces 3.4.2 and Facelets and running in Tomcat 7. Second, and probably the most important, the code presented above is included through a tab into a larger xhtml:
<ui:define name="body">
<rich:panel styleClass="createFormPanel">
<h:panelGroup layout="block" style="margin:0 auto;width:100%;" id="principalPanel">
<div style="height: 665px"><p:tabView id="tabs" widgetVar="tabsView" activeIndex="#{oaBean.activeTab}">
<p:tab id="tab5" title="#{messages['oa.tab.contenido']}">
<h:form id="formTab2">
<ui:include src="/pages/oa/tabContenido.xhtml" />
</h:form>
</p:tab>
</p:tabView></div>
</h:panelGroup>
</rich:panel>
</ui:define>
In this case, tabContenido.xhtml is the page containing the data table definition. Didn't include the java code because is just a bean with getter and setter values. If you need more information just let me know.
Regards.

Answer 1

Try adding an ajax event to the column and updating the hole table, something like this:
<p:column headerText="#{messages['documento.orden']}"
style="width:25px; text-align: center" id="columnOrden">
<p:inputText id="ordenDocumento" value="#{documento.orden}"
disabled="#{documento.eliminado}" style="font-size:0.9em" size="2"
validator="floatValidator">
<p:ajax event="change" update="documentoList" />
</p:inputText>
</p:column>