Solution : https://service.sap.com/sap/support/notes/803507 (SAP Service marketplace login required)
Key words : 
sapbwnews bw sp11 netweaver'04 stack 11, 0b            import support package 26, 10 content            import support package 20, infoobjects - authorization object s_rs_admwb, administrator workbench object', 50            import support package 11, 0b support package 26, general maintenance authorization, s_rs_admwb authorization object, s_rs_iobj authorization object
Related Notes : 
       
| 763338 | SAPBWNews BW Support Package 11 NW'04 stack 11 RIN | 
| 723262 | SAPBWNews BW 3.1 SP Content 20 | 
| 723257 | SAPBWNews BW 3.0B Support Package 26 |