Central SLD Configuration - SXMB_ADMIN

Hi Guys.

I've serached the the forum but can not find exactly what I am looking for. I have installed a DEV SRM and XI system and a QAS SRM and XI system. I have set up the DEV XI system as the Central SLD. My question is in the post steps for QAS XI. Under tcode SXMB_ADMIN, for the Integration Engine Configuration, what should I define as the Role of the Business System for this system?

Thanks

Chris