Shipping documentation rules allow you to specific what documents are required when shipping out an order e.g. a shipment outside the UK by a courier will need a commercial invoice. When a document is required the order will be place into the "AwaitingDocumentation" status and emails will be sent to the client request the required documents are uploaded. Once the documentation is uploaded it will be returned to it's original order status e.g. "New or Printed".
Shipping Documentation rules can be found in the shipping extras page - Shipping > Extras
To Create new rule Click "Create"
Then select the type of document that is required & the country/shipping zone and the courier service.
Once the rule is created any order that comes into the system will be checked to see if any documentation is required.