Canot Remove Roles or Workgroups

In the file or directory properties, having set the Role or Workgroup, it is not possible to remove them.

If, for example you set the 'Access Type' to Restricted and the 'Roles' to Sales and save these changes, all is fine.

Then reopen the Properties window, set the 'Access Type' to Public and CTRL-Click on Sales (to remove the selection) and save the changes.

Reopen the Properties window again, the Access Type' is Public and the Sales Role is still selected.