code using the drupal systems outside of the drupal root

Hello. I had a issue using your module when a custom code using the drupal systems outside of the drupal root installation. To resolve this issue i change the file vat_number.module in the line 3 (require_once(drupal_get_path ('module', 'vat_number') . '/vat_number.inc');) for

$vat_path = drupal_get_path('module', 'vat_number');
require_once DRUPAL_ROOT . '/' . $vat_path . '/vat_number.inc';

I hope this can help some body else