I would like to create security rule for different groups in my Sales Pipeline. For example, I have a pipeline consisting of 6 stages. The goal is to achieve update access to 1st,2nd, 3rd and 6th column and readonly rights to columns with shared_id = 4 and 5. User group should keep rights to enter new messages to all tasks (own and others) at any stage. I couldn't find why the user group can update tasks once on the readonly columns if they enter new message to any tasks (own and others tasks). I suppose by entering a new message on tasks created by others, user becomes a follower and gains another set of rights. How can I restrict user from changing stage of task on readonly columns while being able to enter new message?