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MetaTrader error codes / MT5 trade return codes

MT5 error 10030: Invalid order filling type (TRADE_RETCODE_INVALID_FILL)

The filling mode (FOK, IOC or Return) isn't allowed for this symbol at this broker. Nothing was executed; pick an allowed mode.

10030TRADE_RETCODE_INVALID_FILL
After a fixSafe to retry?
NoCould it have executed?

What it means

You see this code in the retcode of a trade result, from OrderSend() in MQL5 or order_send() in Python.

Every MT5 order has a filling policy: Fill or Kill, Immediate or Cancel, or Return. Brokers allow only some of them per symbol, and 10030 means yours isn't one of them.

It is one of the most common errors when code moves from one broker to another, because the allowed modes differ.

Common causes

  • A hard coded ORDER_FILLING_FOK on a symbol that only allows IOC, or the other way round.
  • No type_filling at all, so the default is used and the broker doesn't accept it.
  • Code written for one broker and run at another.

How to fix it

  • Read symbol_info(name).filling_mode. Bit 1 means FOK is allowed and bit 2 means IOC is allowed.
  • Choose a mode from those bits for each order.
  • A common pattern: try FOK, then IOC, and use Return when neither bit is set.

Example in Python:

import MetaTrader5 as mt5

def filling_for(symbol):
    modes = mt5.symbol_info(symbol).filling_mode
    if modes & 1:                       # FOK allowed
        return mt5.ORDER_FILLING_FOK
    if modes & 2:                       # IOC allowed
        return mt5.ORDER_FILLING_IOC
    return mt5.ORDER_FILLING_RETURN

request["type_filling"] = filling_for(request["symbol"])
print(mt5.order_check(request).retcode)  # 0 means the request looks fine

Is it safe to retry?

Yes, with a different filling mode. The first request was refused.

Could the order have executed?

No. The order was refused because of its filling mode.

How Tickwire handles it

Tickwire chooses from the symbol's allowed modes and checks the request with the terminal before sending. If the broker still answers 10030, it tries the next mode.

You can set your own order of preference with fillingModes. The default is FOK, IOC, Return for market orders and Return, FOK, IOC for pending orders. See broker quirks.

MT4 has no filling modes, so this code doesn't occur there.

Related MT5 Python functions

All MetaTrader error codes

One API for MT4 and MT5

Clear trade outcomes, idempotent orders and an audit log. Read the error reference or the quickstart.

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