I have this menuItem

<rich:menuItem value="Mantenimiento" id="menuMantenimiento"
     action="#{mapsBean.mantenimiento(img.hostId)}"
     rendered="#{img.element.elementtype!=3 and img.mnt==0}"
     onselect="javascript:if(!confirm(Are you sure?'))return false;">
</rich:menuItem>

And the action method:

public void mantenimiento(Long hostId){
          try{
               Hosts host=(Hosts) entityManager.createQuery("from Hosts h where h.hostid="+hostId+"").getSingleResult();
               host.setMantenimiento(HOST_MANTENIMIENTO);
               entityManager.persist(host);
          }catch(Exception e){
               FacesMessages.instance().add("Error: "+e);
               log.error("mantenimiento - Error: "+e);
          
          }
     }

When I call the action method, the conversationId is lost from the url. What should I do to keep the cid alive??