Solution : https://service.sap.com/sap/support/notes/569173 (SAP Service marketplace login required)
Key words : 
1 content            import support package 2, 0b            import support package 8, 0b support package 8, 1c support package 2, -cumulative cube reason, terms incorrect values, bw support packages, time reference characteristic, support package, -cumulative cubes
Related Notes : 
       
| 567740 | Initial values when updating into stock cubes | 
| 539817 | SAPBWNews BW 3.1 Content Support Package 02 | 
| 523240 | SAPBWNews BW 3.0B Support Package 08 |