When you use traditional sales orders, create a pre-shipper/shipper for a self-billing sales order using Pre-Shipper/Shipper Workbench or Picklist/Pre-Shipper - Automatic and then confirm the pre-shipper/shipper using Pre-Shipper/Shipper Confirm. Since the self-billing invoices cannot be processed with the Invoice Post and Print function, you cannot post or print self-billing invoices at shipper confirmation.