OrderModify does not seem to work during EA backtesting

[JBVQ2020]

Hi Experts,

I need your valuable help on the following peace of code, I am trying to modify an open order as part of my EA 
but during the back testing it does not seems to be working. 
I have tested with several pairs, time-frames and time range but it does not seems to modify any order. Here is the peace of code:

if(OrderSelect(openOrderID,SELECT_BY_TICKET)==true && OrdersTotal()!=0)

      {

      int orderType = OrderType();// Short = 1, Long = 0

      double optimalTakeProfit;

            if(orderType == 0)//long position

            {

                optimalTakeProfit = NormalizeDouble(bbUpperProfitExit,Digits); 

            }

            else //if short

            {

                optimalTakeProfit = NormalizeDouble(bbLowerProfitExit,Digits);

            }

            double TP = OrderTakeProfit();

            double TPdistance = MathAbs(TP - optimalTakeProfit);

            if(TP != optimalTakeProfit && TPdistance > 0.0001)

            {

               bool Ans = OrderModify(OrderTicket(), OrderOpenPrice(),OrderStopLoss(),optimalTakeProfit,0,clrAqua);

               Print ("Order Type is: ", OrderType(), "Order Ticket is: " + openOrderID);

               if (Ans==true)                     

{

                  Print("Order modified: ",openOrderID);

                  return;                           

                }

               else

                {

                  Print("Unable to modify order: ",openOrderID);

                }       

         }

      }

Could you please help me to spot the error in the logic of the code?

Many thanks in advance