Solution : https://service.sap.com/sap/support/notes/792435 (SAP Service marketplace login required)
Key words : 
sapbwnews bw sp11 netweaver'04 stack 11, fact tables performed manually, 10 content            import support package 20, 0b            import support package 26, 0 bi            import support package 16, 1 bi            import support package 04, terms selective deletion, 50            import support package 11, operational data store, prerequisites deleting data
Related Notes : 
       
| 1440016 | Selective deletion: Name of the temporary tables | 
| 1417102 | IBM i: Performance problems during selective deletion | 
| 1403455 | BW:Selective deletion: No. of deteleted records is incorrect | 
| 1335666 | Selective deletion on ORA F table with too many partitions | 
| 991372 | Selective deletion from InfoCubes takes a long time | 
| 976930 | FACT attribute missing for fact tables on database | 
| 920695 | Number of deleted records incorrect after selective deletion | 
| 901037 | INITRANS parameter after delete operations |