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[stleon]

Os pongo el código de Flat4.php

<?php
/*
$Id: flat.php 1749 2007-12-20 00:52:16Z hpdl $

osCommerce, Open Source E-Commerce Solutions
http://www.oscommerce.com

Copyright (c) 2004 osCommerce

Released under the GNU General Public License
*/

class flat4 {
var $code, $title, $description, $icon, $enabled;

// class constructor
function flat4() {
global $order;

$this->code = 'flat4';
$this->title = MODULE_SHIPPING_FLAT_TEXT_TITLE_4;
$this->description = MODULE_SHIPPING_FLAT_TEXT_DESCRIPTION_4;
$this->sort_order = MODULE_SHIPPING_FLAT_SORT_ORDER_4;
$this->icon = '';
$this->tax_class = MODULE_SHIPPING_FLAT_TAX_CLASS_4;
$this->enabled = ((MODULE_SHIPPING_FLAT_STATUS_4 == 'True') ? true : false);

if ( ($this->enabled == true) && ((int)MODULE_SHIPPING_FLAT_ZONE_4 > 0) ) {
$check_flag = false;
$check_query = tep_db_query("select zone_id from " . TABLE_ZONES_TO_GEO_ZONES . " where geo_zone_id = '" . MODULE_SHIPPING_FLAT_ZONE_4 . "' and zone_country_id = '" . $order->delivery['country']['id'] . "' order by zone_id");
while ($check = tep_db_fetch_array($check_query)) {
if ($check['zone_id'] < 1) {
$check_flag = true;
break;
} elseif ($check['zone_id'] == $order->delivery['zone_id']) {
$check_flag = true;
break;
}
}

if ($check_flag == false) {
$this->enabled = false;
}
}
}

// class methods
function quote($method = '') {
global $order;

$this->quotes = array('id' => $this->code,
'module' => MODULE_SHIPPING_FLAT_TEXT_TITLE,
'methods' => array(array('id' => $this->code,
'title' => MODULE_SHIPPING_FLAT_TEXT_WAY,
'cost' => MODULE_SHIPPING_FLAT_COST_4)));

if ($this->tax_class > 0) {
$this->quotes['tax'] = tep_get_tax_rate($this->tax_class, $order->delivery['country']['id'], $order->delivery['zone_id']);
}

if (tep_not_null($this->icon)) $this->quotes['icon'] = tep_image($this->icon, $this->title);

return $this->quotes;
}

function check() {
if (!isset($this->_check)) {
$check_query = tep_db_query("select configuration_value from " . TABLE_CONFIGURATION . " where configuration_key = 'MODULE_SHIPPING_FLAT_STATUS_4'");
$this->_check = tep_db_num_rows($check_query);
}
return $this->_check;
}

function install() {
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Enable Flat Shipping', 'MODULE_SHIPPING_FLAT_STATUS_4', 'True', 'Do you want to offer flat rate shipping?', '6', '0', 'tep_cfg_select_option(array(\'True\', \'False\'), ', now())");
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Shipping Cost', 'MODULE_SHIPPING_FLAT_COST_4', '5.00', 'The shipping cost for all orders using this shipping method.', '6', '0', now())");
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('Tax Class', 'MODULE_SHIPPING_FLAT_TAX_CLASS_4', '0', 'Use the following tax class on the shipping fee.', '6', '0', 'tep_get_tax_class_title', 'tep_cfg_pull_down_tax_classes(', now())");
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, use_function, set_function, date_added) values ('Shipping Zone', 'MODULE_SHIPPING_FLAT_ZONE_4', '0', 'If a zone is selected, only enable this shipping method for that zone.', '6', '0', 'tep_get_zone_class_title', 'tep_cfg_pull_down_zone_classes(', now())");
tep_db_query("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, date_added) values ('Sort Order', 'MODULE_SHIPPING_FLAT_SORT_ORDER_4', '0', 'Sort order of display.', '6', '0', now())");
}

function remove() {
tep_db_query("delete from " . TABLE_CONFIGURATION . " where configuration_key in ('" . implode("', '", $this->keys()) . "')");
}

function keys() {
return array('MODULE_SHIPPING_FLAT_STATUS_4', 'MODULE_SHIPPING_FLAT_COST_4', 'MODULE_SHIPPING_FLAT_TAX_CLASS_4', 'MODULE_SHIPPING_FLAT_ZONE_4', 'MODULE_SHIPPING_FLAT_SORT_ORDER_4');
}
}
?>




La verdad es que no se donde está el problema.
Los otros archivos flat.php son iguales pero retocados con flat1.php para una zona
flat2.php para otra zona
flat3.php para otra zona.