When customer is a supplier at the same time

First of all i would like to thank you for designing such an Amazing Software that too for FREE!

i am looking to purchase a server edition very Soon :grinning:

But I have a point here to mention, Being a student of Commerce i love accounting and love this software as well now coming to my point. In case a customer sometimes become a supplier how to maintain the invoice or vice versa their account does not affect at all by having an one account in customer list and other one in supplier Please Help in such case

Have a look at http://guides.manager.io/businesses/customers/contra-entries

Do we need to make separate account for a customer in Supplier Tab