Inside the Output window you will not see two logs of this as NinjaTrader will handle this "under-the-hood", so you will only see the Entry order but you will see an order called "Close position"
Like the following:
7/29/2013 4:31:00 PM Entered internal PlaceOrder() method at 7/29/2013 4:31:00 PM: BarsInProgress=0 Action=Buy OrderType=Market Quantity=1 LimitPrice=0 StopPrice=0 SignalName='' FromEntrySignal=''
7/29/2013 6:38:00 PM Entered internal PlaceOrder() method at 7/29/2013 6:38:00 PM: BarsInProgress=0 Action=SellShort OrderType=Limit Quantity=1 LimitPrice=1684.50 StopPrice=0 SignalName='' FromEntrySignal=''
7/29/2013 6:48:00 PM Entered internal PlaceOrder() method at 7/29/2013 6:48:00 PM: BarsInProgress=0 Action=Buy OrderType=Market Quantity=1 LimitPrice=0 StopPrice=0 SignalName='' FromEntrySignal=''
You may also see the following image.

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