The document discusses updating the smart form Z_DED_MM_BESTELLUNG_GST to fetch delivery schedule details from purchase orders, similar to how it is done in the smart form ZDED_MM_BESTELLUNG_NEU. Currently, delivery schedule details are not fetching in Z_DED_MM_BESTELLUNG_GST. The logic for fetching delivery schedules, whether single, multiple, or no schedules, refers to how it is handled in the smart form ZDED_MM_BESTELLUNG_NEU based on delivery dates in the PEKKO table.