I had inadvertantly added a test result as passed. I attempted to edit the status and was unable. I did add a retest but it would have been much more convenient in this case to edit the status.
One of the reasons for this behavior is that we use different dialogs for the passed/failed and retest actions. Passed/failed use the detailed dialog where you can specify version numbers, defects IDs etc. and the retest dialog basically has a text field only. So, when you edit a passed result, you would only have the choice between passed and failed. From a UI perspective, it would be difficult to implement changing the test status (we want to keep the dialogs simple), so we decided not to allow changing the test status of a test result afterwards. But we take your comment as suggestion of course and we’ll see what we can do in this regard. Thanks!