Typically, in ECC, the entries are logged to the change document tables (CDHDR/CDPOS) via a transaction code for each creation, change or deletion indicating also the user and TCode who modified the document.
However, when I post the same document via a Fiori App, it doesn't write any change documents.
How does S4/HANA store change documents posted by Fiori Apps?
Is there any other place that data is stored? How can the client see a log of these activities?