Solution : https://service.sap.com/sap/support/notes/629124 (SAP Service marketplace login required)
Key words : 
<sap_bw_url cmd='log_off'>& sap-sessioncmd=cancel, sap-sessioncmd=cancel form field, source code correction makes, query requests started previously, 0b            import support package 14, 1c            import support package 08, cmd=log_off parameter, bw sap urls, automatic cancel function, work process reason
Related Notes : 
       
| 634237 | Session preservation to timeout with statefull Web apps. | 
| 571743 | SAPBWNews BW 3.1 Content Support Package 08 | 
| 571695 | SAPBWNews BW 3.0B Support Package 14 | 
| 539829 | SAPBWNews BW 3.1 Content Support Package 07 | 
| 523278 | SAPBWNews BW 3.0B Support Package 13 |