manual adding a new appointment

Hi,

I noticed that I was able to manually add a new appointment at the same time, date , and provider as one already paid or pending without getting an error that the time is not available?

October 31, 2012 11:00 am Silver Package nina pending

October 31, 2012 11:00 am Silver Package nina pending

October 31, 2012 11:00 am Platinum Package nina paid

Is this working as design?

Thanks!