[Cin] Ctrl+! shortcut for Timecode doesn't work

Maybe I wrong to write here because, probably, it depends by my system, but... Using MMB (Middle Mouse Button) on an edit, in theTimeline, a pop-up menu come out. The last option is "Timecode Ctrl+!". If I click on that option the timecode is set on the timebar of the Timeline correctly. If I select the edit (a red frame is shown) and use Ctrl+! shortcut nothing occurs. Maybe, am I wrong to use that? Can someone confirm, or not, please? Thanks! IgorBeg