Required autocomplete field I have an 'Entity Reference' autocomplete field populated by a view that returns all authenticated user email addresses.  I have set the field to 'Required' but when I enter an email address not in the list and save the node, it doesn't trigger an error.  It just makes the field blank.  Is there anything I can do to force the node not to save if a valid email address has not been entered?
You should try changing the no results message in the view, maybe have return an invalid address like a@a@a.c or something.