If you need to undertake maintenance for your BMW R 1150 GS then it is usually recommended to own a Workshop Manual to use as a reference in the event you need to know how you can remove a specific part for example Dashboard and match it again effectively.
BMW R 1150 GS Workshop Manuals gives you unique diagnostic info for the vehicle therefore if something is wrong it will help you work out what the issue is and the way to resolve it. You will be able to determine if you can do this yourself or that the job is just too big you can actually book your R 1150 GS in to a trusted garage.
BMW R 1150 GS manual