Check if datasource is generic or not?

Hi,

i wanted to know, how to see, if a datasource is a generic datasource or not?

I tried following two transactions:

1. RSO2:

In transaction RSO2, i can search for all datasources which are available in the system, for datasources where i believe that these are not generic, i receive a warning message "DataSource 0* is extracted using functional module RSTC_BIRS_OLAP_AGGREGATED_DATA" and Extraction from fields are empty.

2. RSA2:

In transaction RSA2, there is a checkbox "Gen. Interface" , but i also see generic datasources in the system for which this flag is not set.  

I also checked table ROOSOURCE but without success.

Does anyone have any suggestions?

BR

M.Y.