Hi cgeo,

I can confirm that you can not stop or remove a single subsciption from your adapter.
In a case like this you should force the termination of entire session.
Please refer to this post for a discussion of the solutions avaliable for this purpose: https://forums.lightstreamer.com/sho...on-termination

Furthermore, if you want to avoid that this operation affected also the data flow for ItemA, you should use two different (and non-sharing) client session.
In order that your adapter close only the client session involved in ItemB subscription but updates for ItemA will not have any repercussion.

Please let us know if you need any further clarifications.

Regards,
Giuseppe