Solution : https://service.sap.com/sap/support/notes/1390588 (SAP Service marketplace login required)
Key words : 
terms mdc multi-dimensional clustering performance sql0270n reason, sapbwnews bw sp25 netweaver'04 stack 25, e-fact table, f-fact table, checking space consumption, sap netweaver bw 7, sap netweaver bi 7, sap nw bi7, unique p-index, 01 bi abap sp06
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 | 
| 1243557 | SAPBWNews BW Support Package 25 NW'04 Stack 25 RIN |