MQL4 Stoploss

Hello everyone. I've coded this piece here:

for(int i=0;i<OrdersTotal();i++)
     {
      bool select = OrderSelect(i,SELECT_BY_POS,MODE_TRADES); //Iteration through every trade
      if(OrderMagicNumber()==1 && OrderSymbol()==Symbol()) //if Trade==BUY
        {
         if(Close[1]>OrderStopLoss()+atr && Close[1]>OrderOpenPrice()+atr) //is the price already greater than the opening price+ATR, and than the stoploss+ATR?
           {
            bool order = OrderModify(OrderTicket(),OrderOpenPrice(),NormalizeDouble(OrderStopLoss()+atr-0.0005,5),0,0,clrAquamarine);
            if(!order){Alert(GetLastError());}
           }
         else
           {
            return;
           }
        }
}

But the stoploss keeps moving on every tick. I know it is due to the '-0.0005', but I would like to have that added 'margin'. How could I manage it to stop from moving on every tick, without having to remove this -0.0005 margin?

thank you very much in advance.

If you wanna place SL when you open orders, then you simply need to adjust SL at this moment using OpenOrder function.

If you wanna place SL at a particular event then you have to add the following condition... Does my SL is null, if so, apply your code else nothing.

So it should do it only once.

I think, hi wanted to realize Trailing Stop at distance (ATR-0.0005)

you should separate your conditions from ordermodify command!