Adding authorization object for "Function Group"s ?

Is it possible to add any authorization object for any function group ?

We have an issue i.e. whenever user "XYZ" is getting some Windows Excel related error whenever trying call an excel report from BW server. System log related to "XYZ" user shows that -> User "XYZ" has no RFC authorization for the function group "ABCD". The RFC authorization object is S_RFC.

Function Group you can check through SE37->GoTO->Display Function Group

Now is it possible to add authorization for any "Function Group" ?