On occasion an EDI transmission fails because of an address conflict or for other reasons. It is then necessary to re-export invoices to generate the flat file. The only way it is possible now, is to go into BKEDIPOST using Maintain Database and enter the invoice #s and billing codes.  
It would help if there was a menu option under the EDI menu that allows for this info to be manually added and edited.
 
A long time ago I remeber seeing a posting indicating that this will be added in the updates, but it never was
 
Using DBA Classic - latest updates