If you are VAT registered and export to other EC (European Community) countries you will need to fill in an EC Sales list. You can get a list by using the EC Sales list filter in Sales Transactions. Either export that report or create yourself a new filter based on this one and add conditions to restrict the date range. At the moment there is no way of showing each customer's VAT number against a sale, which you will need for the report, so it is best to copy and paste that into the Notes column when you enter export transactions. We have a task set to add a suitable column to make this simple for the future (task ID#1553).
On the EC Sales List there is a column on the right called 'Indicator'. Here are the values and meanings:
0 = Goods
2 = Intermediate supplier in a triangulated sales (I think this probably needs further clarification! - full details on the HMRC site - link below)
3 = Services
http://customs.hmrc.gov.uk/channelsPortalWebApp/channelsPortalWebApp.portal?_nfpb=true&_pageLabel=pageImport_ShowContent&propertyType=document&featurearticle=true&id=HMCE_PROD_008783