Solution : https://service.sap.com/sap/support/notes/399704 (SAP Service marketplace login required)
Key words : 
rfc destinations               transaction role maintenance, symptom calling sap transactions, maintaining trusted/trusting connections, trusted/trusting connections               prior, normal rfc destinations               prior, bex browser supports maintenance, trusted/trusting connections 3, trusted/trusting connections 6, trusted/trusting connections, call sap transactions
Related Notes : 
       
| 523217 | SAPBWNews for BW 3.0A Support Package 12 | 
| 523196 | SAPBWNews BW 2.1C Support Package 18 | 
| 523133 | SAPBWNews BW 2.0B Support Package 26 | 
| 493975 | SAPBWNews BW 3.0B Support Package 04 | 
| 456549 | SAPBWNews BW 2.0B Support Package 22 | 
| 374845 | SAPBWNews BW 2.0B Support Package 16 | 
| 374844 | SAPBWNews BW 2.0B Support Package 15 | 
| 128447 | Trusted/trusting systems |