Hi guys!
I've stucked on this like a week ago and i hope someone has a clue.

Here´s the situation.

I have a modal panel with an ajax commmandButton, and when i press it, the method on the backing bean makes some validations.
If there´s exists not valid data i throw an exception, and add to FacesMessage a message.

I tried with all components like h message or rich message, but without succed.

Here you have the code.

This is the button on the page

<a:commandButton value="Aceptar" rendered="#{movimientoHome.operacionSeleccionada != 'Transferir'}"
          propagation="default" title="Aceptar"
               id="btnStockModif" 
              action="#{stockHome.agregarProductoAfectado()}" reRender="stockSelecList">
</a:commandButton>

Here is where i add the message to FacesMessage:

catch (NoResultException e) {
        e.printStackTrace();
     FacesMessages.instance().add("No existe un factor para las unidades de medida seleccionadas");
     return false;
}

I have deleted from the coded all the message components, hoping someone has an idea where to put it.

Thanx in advice guys!!! I really need this help.!