Invoke Billing Smartform

Hie guys

I would like to invoke smartform for billing in my program as i wish to attach it and send through in an email, functionality of sending billing document by email has not worked for us. However as i try and populate the structures i get error:

Error in address field (name not filled). How can resolve this and what are the necessary fields that i need to populate in order to invoke the smartform?

regards

Isaac Prince