请问最后一行代码有无出错？

variable:bj=0;

tr1 : max(max((high-low),abs(ref(close,1)-high)),abs(ref(close,1)-low));

atr : ma(tr1,20);                               //atr公式

ma20:ma(close,20);                               //20日均线

a1:=0.01*valuewhen(barpos=1,asset);              //初始资金的1%

a2:=floor(a1/(2*atr));                         //开仓手数

a3:=ref(hhv(high,20),1);                       //20日高点

if holding=0 and close>a3 and close>ma20 and bj=0

then begin

buy(1,a2,marketr);

bj:=1;

end                                   //第一次开仓

if holidng=0 and close>enterprice+2*atr and bj=1 

then begin

buy(1,a2,marketr);

end                                 //请问这里还是if holidng=0吗？还是应该是if holidng>0 ？