Help needed for AFL

#1
I need help for scanning/exploration. I need the scan to show only the last signals generated on an hourly scan i.e. suppose I run a scan at 1.20 P.M. for 21 period MA cross over for the day for hourly signals, I want the scan to show only the last signal generated, if any at 1 PM, though there may have been 2 or 3 crossovers during the day on the hourly charts at maybe 10 AM and again at 12 noon but I need the scan to show a buy or a sell only if a signal was generated at the end of the last hour of running the scan.
I will be very grateful if somebody can help me on this.
 

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