Undo the bill and start again. Make sure in the client information that the client is set for ledes98 billing. In general you want to put the bills in proof and then submit. 

Thank you, Caren! I did undo it, but the slips are gone and the invoice still appears in Billing Assistant under Billing History.

Thank you, Caren! I did undo it, but the slips are gone and the invoice still appears in Billing Assistant under Billing History.

Sounds like a problem in the undo. Might want to duplicate the Slips to a temporary client in order to create the bill. I would also run a back up and run the data verification with look for errors and check the client balance to see where it went wrong as may need to fix the balance.