We achieve this by adding it as a note on the order. It'd be good if the customer VAT number was a specific field within the customer record though so it could be pulled through from amazon, magento etc
This would also be good for us - even bringing the Customers VAT numbers in from Amazon too.
We're requested by HMRC to add VAT numbers to invoice for VAT exceptions but there appears to be no field to add this?
Is this is something that is in the pipeline?