Change data on form submit handler

I have a form alter handler like this.

function toyotaec_form_webform_client_form_seleccionar_alter(&$form, &$form_state) {
    $concesionarias = concesionarias();

    $form['actions']['submit']['#value'] = 'Enviar';
    $form['submitted']['concesionaria']['#options'] = $concesionarias;
    $form['#validate'][] = 'toyotaec_form_webform_client_form_seleccionar_validate';
    $form['#submit'][] = 'toyotaec_form_webform_client_form_seleccionar_submit';

Actually, this code is not a hook_form_alter but a function called by the actual hook. The hook calls this function passing &$form and &$form_state also by reference.

After this, I have the corresponding handlers. Both handlers are called as expected. The handler I want to focus in is as follows:

function toyotaec_form_webform_client_form_seleccionar_submit(&$form, &$form_state) {
    $values = $form_state['values']['submitted_tree'];
    $input = &$form['submitted'];

    $concesionaria = trim($values['concesionaria']);
    $redirigir = trim($values['redirigir']);
    $modelo = trim($values['modelo']);

    //obtenemos cual es la concesionaria (por marca, descartamos las ciudades)
    $mconcesionaria = current(explode('-', $concesionaria));

    //las redirecciones diferidas van a tener una salvada incluyendo la url.
    //las redirecciones directas no van a tener salvada.
    $form_state['values']['submitted']['3'] = _redirect_bystore($mconcesionaria, $redirigir, $form_state, $concesionaria, $modelo);

For the last line, I also tried assigning $form_state['values']['submitted_tree']['url']. This url field is the 3rd field and I have to keep track of it, but even when the data is stored in the array (confirmed by using dpm() on it), the form result has a blank url field.

For this, I’m using Webforms in Drupal 7.

My question is: how can I alter the submitted data? It seems that – for the submit handler – form state is not passed by reference.

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