title: Allow attaching files but not editing Note text
body: <p>I have a basic need to protect the integrity of note text in my system; specifically, once a note has been created, no CSR should be able to edit it (higher levels, maybe). Ideally, it should be immutable once created, but I'll allow the CSR that created it to edit it if that's what's necessary; the big deal is that nobody else should have that access.</p>
  
  <p>The basic role permission that enables this is the Write permission of the Note entity. By setting this to "No Access" but still granting access to Create and Append, users can still write new Notes on any Entity they can "Append To" from a form where the notes exist as a subgrid, but they cannot edit any existing Note.</p>
  
  <p>There are, however, two problems with this. First, I lose the "Add New Note" button in the Ribbon. Not a huge deal but it does force the user to add Notes using the inline editor of the subgrid. The bigger deal is that I lose the Attach File button. CSRs still need to be able to attach files, even if they can't edit notes once created.</p>
  
  <p>Is there a way to do what I need?</p>