modeling subscription in XDM -> use XDM Individual or custom class
I have got project for telco company. The user might have multiple subscriptions. We are still in the discovery phase.
I see that subscriptions might be included in the Data Model in two following ways.
1. XDM Individual Profile Class + Subscription Data Type
Pros:
It would be included in RTCP
However when I tried to model something like that I got the error:

Do you know what it might be about???
2. Custom Subscription Class + Subscription Data Type
Pros:
Might be more customizable?