Solution : https://service.sap.com/sap/support/notes/335444 (SAP Service marketplace login required)
Key words :
additional key words downward-compatible kernel, function module susr_reset_all_user_buffers deletes, users suddenly lose, user-dependent rebuild, client copy environment, symptom logged, 6b systems, table usrbf2, table usrbf3, usrbf2 entries
Related Notes :
| 336283 | CC-ERROR: authorization lost after export (SCC8) |