Drag and Drop from Timeline View to Agenda View

Hi all,

If I have two calendars on a dashboard, one has a timeline view and the other has an agenda view. Is it possible to drag a service call from the timeline view to the agenda view? (I know it works the other way around). Whenever I do this I get the following error message. 

If I change the second calendar from agenda view to say, month view, it works without any issues. I presume this has something to do with the time?