Solution : https://service.sap.com/sap/support/notes/598470 (SAP Service marketplace login required)
Key words : 
image format undo contents temporary table, redo version <new_rel> incompatible, log version <new_rel> incompatible, oracle version           <old_rel>ora-00331, oracle version           <old_rel>ora-00600 [2765], release <old_rel>ora-00405, sql execution ora-00902, invalid datatype reason, target releases lower, recent oracle release
Related Notes : 
       
| 794588 | J2EE deployment: TIMESTAMP causes ORA-00902 | 
| 656363 | Composite SAP Note: ORA-01194/ORA-01195 | 
| 310031 | Downgrading an Oracle database | 
| 180605 | Oracle database parameter settings for BW | 
| 124361 | Oracle parameterization (R/3 >= 4.x, Oracle 8.x/9.x) |