[amibroker] lastvalue(Buy) not working for me

["murthysuresh" <money@xxxxxxxxxxxxxx>]

Hello
I ahve a few watchlists. My strategy is to 
-scan daily  meeting 20 day high criteria
- check if they are not in a watchlist
- add them to the watchlist if they are new symbols that are not in 
the watchlist

However this peice of code that i wrote seems to scan fine but keeps 
adding into the watchlist all the symbols that meets 20 day high or 
low irrespective if they exist in a watchlist or not. how do i fix 
it. Is there a bug in if(LastValue( Buy)==1) or am i not using it 
properly.



InWatchListAlready=(InWatchListName( "WoodiesCCI_Step1_20DayLow" ) 
OR  InWatchListName( "WoodiesCCI_Step1_20DayHigh" ) OR InWatchListName
( "WoodiesCCI_Step2_Look4Retracement" ) OR  InWatchListName
( "WoodiesCCI_Step3_SetBuy" ) OR InWatchListName
( "WoodiesCCI_Step4_Holding" ) OR InWatchListName( "BreakoutTrade" ));




	
		

		// step 1 find stocks moving lower
	twentyDayLow=Close<Ref(LLV(L,20),-1);
		twentyDayHigh=Close>Ref(HHV(H,20),-1);
		Short=twentyDayLow AND Ref(twentyDayLow,-1)  /* AND 
Ref(twentyDayLow,-2)  AND ADX(14)>20 */  AND Close >20 AND MA(V,20)
>200000 AND !InWatchListAlready ;
		Buy=twentyDayHigh AND Ref(twentyDayHigh,-1)  /* AND 
Ref(twentyDayHigh,-2)    AND ADX(14)>20  */  AND  Close <50   AND MA
(V,20)>200000   AND !InWatchListAlready  ;
		if(LastValue( Short)==1) {
			wlnumber = CategoryFind("Watchlist A", 
categoryWatchlist ); 
			mysymbols = CategoryGetSymbols
(categoryWatchlist, wlnumber );
			CategoryAddSymbol( "", 
categoryWatchlist,wlnumber ); 
			_TRACE("ABTrace adding short " + Name());
		}
		
		 
		
		if(LastValue( Buy)==1) {
			wlnumber = CategoryFind("Watchlist A", 
categoryWatchlist ); 
			mysymbols = CategoryGetSymbols
(categoryWatchlist, wlnumber );
			CategoryAddSymbol( "", 
categoryWatchlist,wlnumber ); 
			_TRACE("ABTrace adding long " + Name());

		}
	     



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