Unlink an incident has been linked by mistake during a test run

Hi 

I have got an incident which has been linked to a test run during execution of a test case by mistake. This incident is aslo linked to some other tests cases. How can I do to unlink the incident to the test case attached by mistake taking into account that I can't erase the incident since it is alo linked to some other tests cases ?

Why do I need that ?  In my reporting, I can see that my last execution of the test case is passed but that it is linked to an incident which is not closed 

Thanks for your help

Regards

Hugues