Link SO - DO - Invoice
Table Invoice/Billing *> VBRK Billing Header *> VBRP Billing Detail - VBELN - Inv Doc - VGBEL - DO Doc - AUBEL - SO Doc Sales Document Flow *> VBFA : Link between SO / DO - VBELV - SO Doc - VBELN - DO Doc Delivery Table *> LIKP : Delivery Header *> LIPS : Delivery Detail - VBELN - DO Doc - VGBEL - SO Doc