Thanks for your reply, Egor!
I also found the blog entry you mentioned but I wasn’t sure if it answers my question. What keeps me wondering is that I am able to create an instance of “CL_GOS_MANAGER” using parameter “IS_BC_OBJECT” without any problems. I would expect that all services being offered in the UI by default are working out of the box like the workflow related ones.
Anyway - thanks for checking....