Cannot edit end date of an event

Hello,

Maybe I'm wrong but it's not possible to modify a lenght of event that's already started in the past. For example there is a event started in 1/07 and planned to finish to 1/09. Today i tried to change finish date to 1/08 22:00 and i can't do that - xibo keeps saying that i can't shedule event in the past.

Maybe it's a good idea to split two situations - creating some event in past (what is bad idea ofcourse and should be blocked) and modyfing already created event in specified situation: start date is in past and unchanged, finish date is changed to something still in future).
Of course I can delete that event if it's already outdated, but it's could be nice so save it in sheduler for archive view purpose.