This is my codes.

includes/languages/yourtemplate/english.php
define('ENTRY_FAX_NUMBER', 'Tax ID Number:');
define('ENTRY_FAX_NUMBER_ERROR', '');
define('ENTRY_FAX_NUMBER_TEXT', '*');


includes/modules/yourtemplate/create_account.php
97 if (strlen($lastname) < ENTRY_LAST_NAME_MIN_LENGTH) {
$error = true;
$messageStack->add('create_account', ENTRY_LAST_NAME_ERROR);
}

102 if (strlen($fax) < 8) {
$error = true;
$messageStack->add('create_account', 'Please enter your Tax ID Number');
}

107 if (ACCOUNT_DOB == 'true') {
if (ENTRY_DOB_MIN_LENGTH > 0 or !empty($_POST['dob'])) {
if (substr_count($dob,'/') > 2 || checkdate((int)substr(zen_date_raw($dob), 4, 2), (int)substr(zen_date_raw($dob), 6, 2), (int)substr(zen_date_raw($dob), 0, 4)) == false) {
$error = true;
$messageStack->add('create_account', ENTRY_DATE_OF_BIRTH_ERROR);
}
}
}

If need to take a look? http://www.haredo.com/wholesale/inde...action=process

Mark