can't delete resolution no matter what the request's status is

can't delete resolution no matter what the request's status is

I did a test:
  1. Guest submit a request
  2. Administrator open the request details (status stays open)
  3. click Edit button, put some text on Resolution section and click Update request button
  4. confirm that the text is visible under Resolution tab
  5. click Edit button, delete all text under Resolution section and click Update request button
  6. the previously entered text is still visible under Resolution tab
  7. under Resolution tab, click Edit icon
  8. delete all text and click Save button
  9. a pop-up box appears with this message: Resolution should not be empty
Any thought on this?

                  New to ADSelfService Plus?