Block registration with VAT number not valid

Hi,

Note that it seems that you're using HikaShop 5.0.4, not the 5.1.0

I was able to reproduce the issue on your website, however, when I try on my local test website with HikaShop 5.1.0, I'm not able to reproduce the problem. I do get blocked when the VAT number is invalid.

So the first thing I would recommend is updating your HikaShop. And if that still doesn't help, we'll need a backend and a FTP access in order to check things out.

Hi,

As I said, I'm not able to reproduce the issue on my local website with HikaShop 5.1.0.
We'll need to investigate directly on your website.
Please provide a backend access and a FTP access via our contact form:
www.hikashop.com/support/contact-us.html

Hi,

Thanks for the accesses.

So the "VAT number not valid" message is displayed by 4 pieces of code in HikaShop. Two in the administrator/components/com_hikashop/classes/user.php and two in administrator/components/com_hikashop/helpers/vat.php
You can search for them with the translation key "VAT_NUMBER_NOT_VALID".
With the FTP access you provided, I've added a writeToLog call in each of these places. This is supposed to add some debug information in the "payment log file" of HikaShop, available in the "Files" section of the HikaShop configuration page in the backend.
I've run a test after this, and nothing came up in the log.
I made sure that I was editing the files of the correct website by temporarily adding an echo to the main index.php file.
So either this "VAT number not valid" message is not displayed by HikaShop but something else on your website, like a custom plugin, or the PHP files are cached and the code changes are not yet taken into account (which shouldn't be the case, since the change in the index.php was taken into account directly ).
I saw a coopweb plugin installed which isn't something standard. I wanted to look at its code but it seems I got banned from the FTP server for some reason. So I had to stop my debugging.

Hello,

There are something that blocking us in many ways, first the debbuging is very difficult and even maybe impossible, maybe due to the "coopweb" plugin.
And now, when I try to reach your plugins manager I get this :

Coopweb or another plugin, so far we don't know... But we're still stuck with something really unusual

All this means that progress on your problem is really not easy, see perhaps this has a link with the very cause of the problem?
Please, desactivate coopweb plugin and any any uneceeseray plugin that can impact the whole backend process or we will obviously achieve nothing...

Sorry for this late returns.
Regards