Duplicate users/customers

-- Error-message(debug-mod must be tuned on) -- : Username in use

How I can allow duplicate from users registrations?
I've removed the login, so I have only the registration form.
But when I try to buy another product with the same email of previous order, I have the error : "Username in use".
I want no login login with username and password from my customers, but for each order I want that they insert all fields.
Haw can I do?

Hi,

In the "Registration" setting of the Checkout tab of the HikaShop configuration, you want to select "guest".
That way, your customers won't have a user account created and they"ll be able to fill in the form and purchase as much as they want.
Note that if there is already a user account for an email address, the system won't allow you to guest checkout with that email address. In that case, you want to first delete the user account before trying.