Solution : https://service.sap.com/sap/support/notes/1164883 (SAP Service marketplace login required)
Key words : 
report    variant        replaced byrfdopr10  sap&audit_üaal  sap&audit_uaalrfdopr10  sap&audit_üail  sap&audit_uailrfksld00  sap&audit_bürg  sap&audit_burgrfdlsd00  sap&audit_d_bü  sap&audit_d_burfsopo00  sap&audit_bürg  sap&audit_burgrfsopo00  sap&audit_d_bü  sap&audit_d_bu, sap&audit_bürg, sap&audit_d_bü, sap&audit_üaal, sap&audit_üail, sap&audit_uaal, sap&audit_uail, sap&audit_burg, sap&audit_d_buvariants, ä ö ü reason
Related Notes : 
       
| 1319517 | Unicode Collection Note | 
| 1074030 | R3trans: "Duplicate key" composite SAP note (as of Rel 6.10) |