All of my sales come through Paypal and are allocated to 4000 General Sales at the moment - I have the Paypal feed set up. The vast majority of these sales are UK with no postage charged to the customer.
However, about 5% of the sales that come through are EU sales. Do I need to categorise those sales as 4100 General Export Sales? On EU sales I also charge postage to the customer, would I categorise that as 4905 Distribution and Carriage? I have worked how to do this by doing a test modification on an invoice from an EU customer, but basically before I go any further, it is actually necessary to do this, or is it OK to continue to have every incoming sale as General Sales?