如何使用 OrderModify() 修改所有当前打开的 position 的获利？

Question

I have opened up to five buy trades with their individual take profit. I want to change the take profit of the first four buy trades to the take profit of number five buy trade. modifyAllBuyOrdTP() is the function created to modify the take profit while findTpL_BuyOrd() function will get the take profit of the last trade that just finished opened. It is not working in strategy tester. I will be grateful to anyone that can help me on this problem. Thank you in advance.

void modifyAllBuyOrdTP(){
       
       if(CountTradesBuy()>=2){
          for(int l_pos_4 = OrdersTotal() - 1; l_pos_4 >= 0; l_pos_4--)
          {
             OrderSelect(l_pos_4, SELECT_BY_TICKET);
             if(OrderSymbol() != Symbol() || OrderMagicNumber() != MagicNumber)
                continue;
             if(OrderTakeProfit() == findTpL_BuyOrd())
                continue;
             if(OrderStopLoss() == 0 && OrderTakeProfit() != findTpL_BuyOrd() && OrderSymbol() == Symbol() && OrderMagicNumber() == MagicNumber){
               if(OrderType() == OP_BUY){
                   ModifyStopsByPrice(OrderTicket(),0,findTpL_BuyOrd());//Print(" b tp ",findTpL_BuyOrd());
               }
             }
          }
      }
   }
    
double findTpL_BuyOrd(){
   double l_ord_TP = 0;
      for(int l_pos_4 = OrdersTotal() - 1; l_pos_4 >= 0; l_pos_4--)
      {
         OrderSelect(l_pos_4, SELECT_BY_POS, MODE_TRADES);
         if(OrderSymbol() != Symbol() || OrderMagicNumber() != MagicNumber)
            continue;
         if(OrderTakeProfit() == 0)
            continue;
         if(OrderTakeProfit()!=0 && OrderSymbol() == Symbol() && OrderMagicNumber() == MagicNumber){
           if(OrderType() == OP_BUY){
               l_ord_TP = OrderTakeProfit();
               break;
           }
         }
      }
  return l_ord_TP;
}

Answer 1

In modifyAllBuyOrdTP() function you should select orders by SELECT_BY_POS if you iterating over them.