Solution : https://service.sap.com/sap/support/notes/771191 (SAP Service marketplace login required)
Key words : 
alter table <f-table_name>     modify default attributes       tablespace <new_tablespace>afterward, aggregate fact tables- admidatcls = data class, update rsdcube    set cubedatcls = 'znewts', update rsdodso    set odsadatcls = 'znewts', cube dimension tables- aggrdatcls = data class, bw administration data remains current, modify default attributes, naming convention /bi /b0, standard data classes dfact, ods- odsadatcls = data class
Related Notes : 
       
| 666061 | FAQ: Database objects, segments and extents | 
| 646681 | Reorganization of tables with BRSPACE | 
| 541538 | FAQ: Reorganization | 
| 154193 | SAPDBA: Reorganizations and ABAP-DDIC | 
| 46272 | Implement new data class in technical settings |