Assigning Permission to the Form

Hi All,

I have a quick question regarding form permission assignment in EPBCS.

There is a form in Planning where one of the groups has write access to all dimensions used in the form. However, I would like this group to have read-only access to the form itself.

I assigned the form permissions as shown below, but users in the group still appear to have write access. Could you please advise on what might be missing or if there's an additional step required to enforce read-only access?