Well, thats no solution for my problem.
The reference is needed so a participant can see (in one list) which appointments are planned for him.
Is it possible to perform a FIND and fill the references with a CREATE FOR EACH or something like that?
How do I find the main/first Appointment BO where I can copy the Participants from?
Maybe I write a Stored Proc to do it, but the database structure of the Appoinment BO is not documented is it?