Solution : https://service.sap.com/sap/support/notes/1042842 (SAP Service marketplace login required)
Key words :
terms activity logs, activity logs, activity log, suitable codepage, error occurs, field blank, view v_p_log_cp, correct codepage, determined dynamically, conversion reason
Related Notes :
1401733 | |
1319517 | Unicode Collection Note |
514967 | Table logging following change in the code page |