Accessing 15 min Data in Hourly Backtesting

I am trying to use 15 mins data Moving Average in Hourly Backtesting.. I have used the below codes to access the 15 min Moving average , but on exploration the 15 min 150 SMA variable is same as the Hourly SMA Moving Average values. How do I solve this ?

TimeFrameSet( in15Minute ); 
TimeFrameRestore(); // 

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