Well you should test function groups and function module coding as per your normal procedures. They are widely used.
Whether they are accessible depends on your roles, right?
Which release are you on?
Prior release 7.01 you can only control at function group level with object S_RFC.
Subsequently you can use RFC_TYPE 'FUNC' to control at module name level if FUGR fails.
Luckily, this check is central and to my knowledge only one developer ever hardcoded it for list outputs, so you should be okay to convert for manual authorizations.
For standard ones from the menu, you will need to deactivate S_RFC (there is not option to un-merge, unfortunately..........). Easiest is to get the names from the menu and paste them into the manual authorization, or use a Su24 "dummy" for the role or scenario.
Dummy's are usefull workarounds and protect you against upgrades as well... (when SAP adds a load of stuff because GRC needs it, and then toasts your roles, sets active auths to inactive and adds new ones which are merged automatically...)
Cheers,
Julius
