Solution : https://service.sap.com/sap/support/notes/524827 (SAP Service marketplace login required)
Key words : 
bw front-end patch includes procedure downloading bw front-end patches, sapserv downloading bw front-end patches, sap business explorer analyzer existing workbooks, \program files\common files\sap\system, service marketplace bw front-end patches, downloading bw front-end patches, sap business explorer web application designer, highest existing sap gui patch, 0a/binary patches/sap gui, bw front-end patch corrects
Related Notes : 
       
| 550285 | Web template can not be loaded in BI WAD | 
| 541121 | Query Designer: Long load times with structures | 
| 540641 | FEP 30A09/30B03: A maximum of 50 characterist. are allowed | 
| 538709 | BEx toolbar appears twice in the form xxxSAPBEXxxx | 
| 537174 | Query problems after upgrade to 3.0 with ODBO | 
| 536705 | F4 Settings in InfoObject maintenance for BEx | 
| 521196 | Problems with queries with cell references in structures | 
| 512272 | BEx Browser generates CPIC 020, SAP 223 entries | 
| 510494 | Restricted key figures are not displayed in query definition | 
| 452322 | Customizing of the progress bar in BEx Analyzer | 
| 396452 | Server-based BW Frontend check | 
| 361222 | SapPatch: Importing GUI Patches | 
| 197460 | BW Frontend Checktool sapbexc.xla | 
| 142705 | Files for the BW support | 
| 96885 | Downloading front end patches |