1. SAP Whitepaper: "SAP Digital Access: Licensing SAP Software for the Digital Age" (April 2018).
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Section "What is Indirect/Digital Access?": Defines Digital Access as occurring "when humans or any device or system indirectly use the Digital Core through a non-SAP intermediary software that is licensed or sold separately." This supports the correctness of both a non-SAP application (A) and a non-SAP front-end (D) as sources of indirect access.
2. SAP Support Note 2648708 - "SAP S/4HANA Digital Access"
Attachment: "Digital Access for SAP S4HANA - FAQ.pdf": This document clarifies the document types that are counted. It lists "Manufacturing document" (covering Production Orders as in option D) and "Quality management document" (covering Defect documents/Quality Notifications as in option A) as two of the nine countable document types.
3. SAP Help Portal: "Digital Access" Documentation for SAP S/4HANA.
The documentation consistently explains that access originating from third-party systems
custom-developed UIs
or any non-SAP application that results in document creation within SAP falls under the Digital Access model. It explicitly excludes scenarios where SAP applications connect to other SAP applications (making option B incorrect).