BEx QD errors "BI system has version; 70000 is required" or "System is not a BI system"

After update of SAP GUI to version 75 there are below error popping up during startup of BEx Query Designer:

"BI system has version; 70000 is required"

or

"System is not a BI system"

This is caused by an architecture change within SAP GUI 75 where BEx tool are now using .Net Connector of version (NCo) 3 whereas in lower versions of the BEx tools the NCo version 2 was used. The SAP standard function modules like RFC_METADATA_GET / RFC_METADATA are used for data exchange between the BEx Query Designer and the SAP BW backend. To run the FMs user needs must have an authorization object S_RFC assigned.  Only this grants the user possibility to run the FMs.

To solve this the roles of the BW developers need to be extended with the mentioned authorization objects.

More information:

2577916 - Error "BI system has version; 70000 is required" or "System is not a BI system" occurs in Bex Analyzer after update to SAP GUI 750

Wiki - Checking Tx RRMX with SAP GUI 750/760