Restrict Payment methods by group

[Miguel86]

Hi:
In my website i have 5 user groups. What i want is to disable to one of the user groups the option to pay with paypal so i went to payment methods and there in payment restrictions by group i disabled paypal for the desired group and saved (i checked and method is removed from ps_module_group). The problem is that you reload the cart logged in with a users that has that user group and paypal is still available. I returned to payment methods and the restriction another time appears and record has been inserted in ps_module group.

 

What is happening, why i cant disable it? Could be possible to modify the paypal.php file the hook hookPayment and put manyally there any check that group id instead of the backoffice option that seems that doesn't work well.

 

I'm using prestashop 1.6.0.5 and upgrade is not simple due i have a CRM desktop program that is no compatible with higher versions of prestashop.

 

Thanks in advance.
Best regards