Solution : https://service.sap.com/sap/support/notes/138937 (SAP Service marketplace login required)
Key words : 
additional key words business information warehouse, /3 service bw gui bw rfc, oss/css message, urgent problem arises, system user id, correct olap trace, relvant information, olap trace, trace number, remote connection
Related Notes : 
       
| 1229206 | Front end check tool SAPBExC.xla (BW 3.x and BI 7.x) | 
| 376997 | BW customer messages with priority 1 (very high) | 
| 309824 | BW problem message/Support Packages, Patches | 
| 214826 | BW 1.2 Frontend checktool sapbexc.xla | 
| 197460 | BW Frontend Checktool sapbexc.xla | 
| 195715 | Service connection types "BW RFC" and "BW GUI" | 
| 137153 | Version of the BW frontend programs | 
| 112458 | Trace log in the Business Explorer | 
| 111623 | BW problem message needs more information |