Configurable::prepareFieldsForSaving

public function prepareFieldsForSaving(array $fields)
{
	if((!isset($fields["CODE"]) || intval($fields["CODE"]) < 0) && isset($fields["ID"]) && intval($fields["ID"]) > 0)
		$fields["CODE"] = $fields["ID"];

	return parent::prepareFieldsForSaving($fields);
}