In my POC (Corporate insurance market) I have multi companies and users in one BT economy. So now individual users (read employees) could change in the future their BT to OST. So in my POC that would be the individual company 'tokens' / money. That should not be possible. Did you think about this use case? Could you have a BT economy where this is not possible for all users?
Or do you have to build that into your own application....
Apologies - I am not following your question. Could you please try giving more details on what is the requirement here?