Order-fragmentation-in-partial-position-closure

CODE:
using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Data;
using WealthLab.Indicators;
using System.Collections.Generic;

namespace WealthScript16
{
   public class MyStrategy : UserStrategyBase
   {
      private bool halfSold = false;

      public MyStrategy() : base()
      {
         StartIndex = 20;
      }

      public override void Initialize(BarHistory bars)
      {
         source = bars.Close;
         pct = 2.00;
         pct = (100.0 - pct) / 100.0;
         multSource = source * pct;
         PlotStopsAndLimits(3);
         PlotStopsAndLimits(3);

         foreach (IndicatorBase ib in _startIndexList)
            if (ib.FirstValidIndex > StartIndex)
               StartIndex = ib.FirstValidIndex;
      }

      public override void Execute(BarHistory bars, int idx)
      {
         int index = idx;
         Position foundPosition0 = FindOpenPosition(0);

         if (foundPosition0 == null)
         {
            Backtester.CancelationCode = 1;
            val = multSource[idx];
            _transaction = PlaceTrade(bars, TransactionType.Buy, OrderType.Limit, val, 0, "Buy " + 2.00 + "% below " + source.Description);
            halfSold = false;
         }
         else
         {
            double profitTarget6Pct = foundPosition0.EntryPrice * 1.06;

            if (!halfSold && bars.Close[idx] >= profitTarget6Pct && foundPosition0.Quantity > 1)
            {
               double quantityToSell = Math.Max(1, foundPosition0.Quantity * 0.5);
               Transaction partialSellTransaction = PlaceTrade(bars, TransactionType.Sell, OrderType.Market, quantityToSell, 0, "Sell half at 6% profit");
               partialSellTransaction.Quantity = quantityToSell;
               halfSold = true;
            }

            if (idx - foundPosition0.EntryBar + 1 >= 20)
            {
               ClosePosition(foundPosition0, OrderType.Market, 0, "Sell after 20 bars");
               halfSold = false;
            }
            else if (foundPosition0.ProfitPctAsOf(idx) >= 15.0)
            {
               ClosePosition(foundPosition0, OrderType.Limit, foundPosition0.EntryPrice * 1.15, "Sell at 15% profit tgt");
               halfSold = false;
            }
         }
      }

      public override void NewWFOInterval(BarHistory bars)
      {
         source = bars.Close;
         pct = 2.00;
         pct = (100.0 - pct) / 100.0;
         multSource = source * pct;
      }

      private double pct;
      private double val;
      private TimeSeries source;
      private TimeSeries multSource;
      private Transaction _transaction;
      private List<IndicatorBase> _startIndexList = new List<IndicatorBase>();
   }
}