Solution : https://service.sap.com/sap/support/notes/1376813 (SAP Service marketplace login required)
Key words : 
fact table unique index distribution key partitioning key hash partitioning dpf reason, primary ke index ~0, sap netweaver bw system, wrong distribution keys, fact tables, sap netweaver bw 7, sap netweaver bi 7, sap nw bi7, 01 bi abap sp06, 02 bi abap sp02
Related Notes : 
       
| 1369212 | SAPBINews NW 7.01 BI ABAP Support Package 06 | 
| 1367864 | SAPBWNews NW BW 7.11 ABAP Support Package 04 | 
| 1367799 | SAPBINews NW7.0 BI ABAP Support Package 23 | 
| 1260071 | SAPBINews NW 7.10 BI ABAP Support Package 08 |