两个开仓方法同时满足即开两次，如何让软件只开一次仓　[金字塔]

 
 if  vol_1>=vol_2+vol_3+vol_4 and c_1<o_1-n6  then 
 begin
  buySHORT(1,lots,limitr,open),IGNORECHECKPRICE;
 HigherAfterEntry:=enterprice;
 LowerAfterEntry:=enterprice;
   end
  
if  vol_1>=avvol*3 and c_1<o_1-n7  then 
  
  begin
  buyshort(1,lots,limitr,open);
 HigherAfterEntry:=enterprice;
 LowerAfterEntry:=enterprice;
   end

 以上两个开仓条件同时满足软件就开了两次仓，而我只要求开一次

variable:n=0

if  vol_1>=vol_2+vol_3+vol_4 and c_1<o_1-n6   and n=0 then 
 begin
  buySHORT(1,lots,limitr,open),IGNORECHECKPRICE;
 HigherAfterEntry:=enterprice;
 LowerAfterEntry:=enterprice;

n:=1;
   end
  
if  vol_1>=avvol*3 and c_1<o_1-n7  and n=0 then 
  
  begin
  buyshort(1,lots,limitr,open);
 HigherAfterEntry:=enterprice;
 LowerAfterEntry:=enterprice;

n:=1;
   end

用全局变量来记录下单状态，为0时能下单，只要有任意一个交易了，变为0，后面的就不能交易