Solution : https://service.sap.com/sap/support/notes/96848 (SAP Service marketplace login required)
Key words : 
oracle server manager  svrmgrl> connect internal   svrmgrl> set autorecovery, /usr/sap/<sid>/sys/exe/run/initsid, svrmgrl> startup mount  svrmgrl> recover database, required offline redo log files   bs> brrestore -, cancel   svrmgrl> alter database open resetlogs, bs> cd $sapdata_home/saparch            bs> brrestore -, bs> cd $sapdata_home/sapreorg            bs> brrestore -, bs> cd $oracle_home/dbs   bs> brrestore -, bs> cd $oracle_home/dbs            bs> brrestore -, bs> cd $sapdata_home/sapbackup            bs> brrestore -
Related Notes : 
       
| 605062 | FAQ: Restore and recovery | 
| 179895 | New BRRESTORE option values -n init_all / all_log | 
| 175926 | BRRESTORE : problems with -m det_log / -m sum_log | 
| 43490 | Collective note: SAPDBA - Restore/recovery |