[amibroker] Buy = Cover - how to eliminate false signal?

["Beachie" <beachie41@xxxxxxxxxxx>]

Hi,
what I'm trying to do is to initiate a "Buy" when a Short has been closed by "Cover".
The code assigned to "Cover" on itself is simple & occurs frequently:
  Cover = H > Ref(H,-2)AND L > Ref(L,-2);

The "Buy = Cover" generates Buys for *all* instance of Cover. What I want is a Buy only to 
occur if the last instance of  Cover was to close a Short, not just when "H > Ref(H,-2)AND 
L > Ref(L,-2)" is true
Thnaks! 



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