If a Exporter already sent set of documents through Send documents (BOTDAV) Transaction and if he wishes to send second set of documents he can utilize the Sending Documents in 2nd Mail (BOTRAD) Transaction.
This transaction is used for advising the document sets in 2nd mail. The user may select any contract party or another party that is entered in this transaction only to be the receiver of the documents. No bookings takes place at all in this transaction.
Select it from the menu item[Export Products -> Export Collection ->Main -> Send Docs in 2nd mail]