Order: Fixes the current volume value when data in orequest is missing

Order.mqh

@@ -934,7 +934,7 @@ class Order : public SymbolInfo {
     _request.type_filling = GetOrderFilling(odata.Get(ORDER_SYMBOL));
     _request.position = oresult.deal;
     _request.price = SymbolInfo::GetCloseOffer(odata.Get<ENUM_ORDER_TYPE>(ORDER_TYPE));
-    _request.volume = orequest.volume;
+    _request.volume = odata.Get<double>(ORDER_VOLUME_CURRENT);
     Order::OrderSend(_request, oresult, oresult_check);
     switch (oresult.retcode) {
       case TRADE_RETCODE_DONE:
@@ -1589,6 +1589,7 @@ class Order : public SymbolInfo {
 #endif
       // Update double values.
       _result &= Refresh(ORDER_PRICE_OPEN);
+      _result &= Refresh(ORDER_VOLUME_INITIAL);
       // Update string values.
       _result &= Refresh(ORDER_SYMBOL);
       _result &= Refresh(ORDER_COMMENT);
@@ -1616,6 +1617,7 @@ class Order : public SymbolInfo {
       _result &= Refresh(ORDER_PRICE_CURRENT);
       _result &= Refresh(ORDER_SL);
       _result &= Refresh(ORDER_TP);
+      _result &= Refresh(ORDER_VOLUME_CURRENT);
     }
     //} else if (IsPending())
     // _result &= Refresh(ORDER_PRICE_STOPLIMIT); // @fixme: Error 69539
@@ -1803,6 +1805,9 @@ class Order : public SymbolInfo {
       case ORDER_VOLUME_CURRENT:
         _result = Order::OrderGetDouble(ORDER_VOLUME_CURRENT, _value);
         break;
+      case ORDER_VOLUME_INITIAL:
+        _result = Order::OrderGetDouble(ORDER_VOLUME_INITIAL, _value);
+        break;
       default:
         return false;
     }