Can't validate Greek VAT

Whenever a Customer from Greece tries to enter the EU VAT number, this message is returned:

Your VAT number can not be used with the country you selected. Please select the right country ( CODE: EL) or make sure your VAT starts with GR

I tried with a valid* VAT number in all possible ways:
- only digits: returns the message above
- EL before the digits: returns the message above
- with GR before the digits: returns this error message "The VAT number you entered is not valid" and changes the input field as ELGRdigits.

(*) verified on Vies

-- HikaShop version -- : HikaShop Essential: 2.2.1
-- Joomla version -- : 1.5.26
-- PHP version -- : 5.3.3
-- Chrome, Firefox

Hi,

Please replace the file administrator/components/com_hikashop/helpers/vat.php with the file in this archive and try again. It should accept the code regardless of whether you use GR or EL at the beginning of the code.

Thanks.
The situation improved.

now the situation is:
- only digits: returns the message (*)
- EL before the digits: returns the message (*), and displays it into the modal window
- with GR before the digits: it works

* Your VAT number can not be used with the country you selected. Please select the right country ( CODE: EL) or make sure your VAT starts with GR

I am not able to reproduce the problem on our end. Can you provide a link to your registration page so that we can see that ?