GBTViewer account should be able to access into ProPower’ database (user tables ) for data retrieval purposes which are on the scope of your testing.
You might get the below error when user tries to access the system table. To protect an unexpected error occurred therefore the permission of Viewer user should not be able to access the system table of database . Please ignore the warning message as below screen shot and try it again to access the data into user tables as per your desired requirement