Solution : https://service.sap.com/sap/support/notes/1380736 (SAP Service marketplace login required)
Key words : 
1 sap businessobjects accelerator index designer sap netweaver business warehouse accelerator 7, accelerated version- sbop acclerator blade- sbop acclerator blade 1, accelerated version- sap bi accelerator- sap bw accelerator 7, master guide sap businessobjects explorer - accelerated version, including sap netweaver business warehouse, 20sap businessobjects explorer blade edition 2, sap® solutions sap businessobjects accelerator, application group- sap businessobjects packages, bw-bex-ot-biasbop explorer, 2 sap businessobjects client tools xi 3
Related Notes : 
       
| 1408739 | SBOP Explorer XI 3.2 - Client Certificate SSO Configuration | 
| 1408159 | When using SSO, the Log Out button doesn't log the user out | 
| 1408156 | Incorrect sort order on Japanese data | 
| 1407675 | Indexing intermittently unstable using OLAP Universes | 
| 1407674 | User cannot change password and is not notified immediately | 
| 1398242 | SIZING SAP BusinessObjects Explorer, accelerated version | 
| 1397539 | SAP BusinessObjects Explorer, acceler. version: Known Issues | 
| 1393505 | BWA 7.20: Central Note | 
| 1392570 | BWA 7.20: Installation | 
| 1392526 | BWA 7.20: Update | 
| 1392524 | BWA 7.20: Upgrade/Migration BIA 7.0 to BWA 7.20 | 
| 1392079 | BWA 7.20: Aggregating Key Figures for Min, Max, Sum | 
| 1391925 | Index statistics data for the Explorer indexes | 
| 1388768 | Unable to use "New Calculations" in SAP Business Explorer | 
| 1388247 | RCA: Managed System Setup for SAP Business Objects Explorer | 
| 1387879 | BWA 7.20: Error message "structure is not a tree" | 
| 1386423 | BO Explorer Wave: Corrections for Explorer UI RSDDTPS | 
| 1384526 | SAP BusinessObjects Explorer, acceler. version: New Features | 
| 1382470 | Function module for license audit SBO Explorer | 
| 1370156 | Composite note for BO Explorer accelerated 7.01 SP06 | 
| 1369898 | BOX accelerated: Corrections based on 7.01 Support Package 5 | 
| 1345194 | MultiProvider for Explorer: Error due to non-cumulatives | 
| 1338216 | Performance Optimization MultiProvider for BO Explorer | 
| 1310665 | Known Issues: SAP BusinessObjects Explorer XI 3.1 SP1 |