In reply to: Dariusz Tułacz
OK, but the basic problem is the inability to query the BPS_Config source with the system account. For the PROD/TEST environment there is no such problem.
if it's a brand new install of a new version, it's probably related to a change that webcon has added in terms of security and system account permissions.
If you want to be able to perform a query in the context of the config database, you will not use the default connection now, you should use a defined connection to a specific database.
You can e.g. create a connection to the bps_content database and windows authenticate. and then in the place where you want to use, for example, a join to content and config (because I assume that's what it's about) use this connection and in the query enter the entire path to config [baza][dbo].[bps_config], e.g.