Empty univers list when using tier 3 connection

Hello,
 
I am having a problem on webi / deski with tier 3 connection mode.
If i whant to create a new report, the list of univers ll be empty. When modifying a report, the only available univers will be those that are already used in one of the queries.
When using direct connection to the databases, the whole list of univers is shown.
 
I didn t make the original installation but wasn t able to reproduce the problem when installing a new server.
 
This problem occured in SP2.7 and applying 6.3 didn t solve it.
 
Does anyone have any leads ?
 
Best regards,