Solution : https://service.sap.com/sap/support/notes/510931 (SAP Service marketplace login required)
Key words : 
sap reference img/bw customizing implementation guide/business information warehouse/reporting-relevant settings /web-based settings, sap netweaver -> sap business information warehouse -> sap bw 3, 0b -> english -> business information warehouse -> administrator workbench -> reporting agent, <port>/sap/bw/doc/tmpl/fldtmpl/ <technical package, managing pre-calculated html pagesthe documents overview transaction, 1080/sap/bw/doc/tmpl/fldtmpl/mbi_offlineif, displaying totals rowsto display totals rows, tips & tricks documentation sap recommend, managing pre-calculated html pages, calculated html pages remain accessible
Related Notes : 
       
| 733422 | 0 KB files when you download pre-calculated Web templates | 
| 674926 | BEx Download Scheduler with several tasks | 
| 606101 | BW 3.xX Front-end Patch 10 | 
| 559047 | BW 3.0B Front-End Patch 07 | 
| 543817 | Activating trace for BW BEx Download Scheduler | 
| 499480 | BW documents cannot be displayed in the browser | 
| 453142 | Information about BW BEx Mobile Intelligence |