data set specific credentials do not work for same data source

Currently a scheduled refresh in power bi service does not allow me to use the same database (e.g. a PostgreSQL database) using different credentials for different views because specific credentials for the same data source are not supported. I receive the following error message "The key didn't match any rows in the table." in the scheduled refreshment. This means that one can currently not use e.g. a dedicated view in PostgreSQL that can be accessed exclusively in a specific power bi report, while other views can only be accessed in other reports.