Meeting room - Allow delegate to change meeting time

Hi,

Exchange 2013 with latest updates / Outlook 2010

I have a meeting room, let's say, Room1. User, User1, books it. NowUser2 needs to change meeting time.

I added User2 as delegate for the Room1, granted him owner rights for the calendar.

When User2 tries to move the meeting in the room calendar, a warning appears, stating something like he is not a meeting organizer and although he can move the meeting no updates will be sent.

Is there any way to let User2 move the meeting and inform other participants about that change?

Adding User2 as delegate for User1 is not an option.