Invited user can be a client in future?

[souzadavi]

The user case: a WHMCS client has others users invited.

One of this user would like to be a new WHMCS customer, He try to order one new service to his own account, but the system give error because it said the user email is a WHMCS user.

So an invited email user to a WHMCS customer can't never to be a WHMCS client in future?

 

Make me feel boring, there is any make around?

 

thanks in advance.