海龟系统，下面黄底部分有问题，我的目的是平仓后又符合建仓条件（但没有cross了），要返回到开1，如何作呢？

IF BARPOS>=21 THEN BEGIN
IF BARPOS=21 THEN
N:=M;
IF DayCount=6 OR BARPOS=21 THEN BEGIN{5天调整N值}
N:=(19*N+TR)/20;{计算N值}
DayCount:=2;
END
DayCount:=DayCount+1;
EntPoint:=ENTERBARS+1;
IF EntPoint=EntAndExitSign THEN BEGIN{说明STOP指令买进头寸成功}
PositionCount:=PositionCount+1;{头寸计数}
SellSign:=True;{开始以STOP卖出，如果达到指定的价格}
END
IF aa THEN BEGIN{第一头寸}
HOW:=CASH(0)*0.001/N;{波动性百分比决定头寸规模}
开1:BUY(BUYHHV,HOW,MARKET);{在20日新高STOP指令买进}
END
IF PositionCount=2 THEN BEGIN{如到第二头寸}
HOW:=CASH(0)*0.011/N;{波动性百分比决定头寸规模}
开2:BUY(h>=ENTERPRICE+0.5*N,HOW,MARKET);{在上头寸(即第一头寸)+0.5个N以STOP指令买进}
END
IF PositionCount=3 THEN BEGIN{如到第三头寸}
HOW:=CASH(0)*0.029/N;
开3:BUY(h>=ENTERPRICE+0.5*N,HOW,MARKET);{在上头寸(即第二头寸)+0.5个N以STOP指令买进}
END
IF PositionCount=4 THEN BEGIN
HOW:=CASH(0)*0.034/N;
开4:BUY(h>=ENTERPRICE+0.5*N,HOW,MARKET);
END
IF SellSign=True THEN BEGIN
    ExitPoint:=EXITBARS+1;
    IF ExitPoint=EntAndExitSign THEN BEGIN {说明卖出成功}
       PositionCount:=1;{头寸计算复原}
       SellSign:=False;
    END
    IF c>ENTERPRICE-1.5*N then SELL(sellllv,100%,MARKET);{退出离盈利头寸}
    ELSE
    SELL(c<=ENTERPRICE-1.5*N,100%,MARKET);{退出亏损头寸}
    END
if bb then begin
HOW:=CASH(0)*0.001/N;
开:BUY(BUYHHV,HOW,MARKET);
end;
END;