Message VN 020. - VF02, error : processing program missing for output medium 5.
That is quiet clear from the error message. Means, configure for transmission medium 5 is miss in procession program.
Output Type: RD00 - Invoice
Application: V3 - Billing
Transm. Medium: 5 - External Send
Program: SD_INVOICE_PRINT01
Form Routine: ENTRY
Form: SD_BIL_MAIL_BODY
PDF/Smartform Form: XLSO_LB_BIL_INVOICE
Form Type: 2 PDF
Thanks,
JP