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MQL5 trade server return code

MQL5 Error 10014: Invalid volume in the request

MQL5 error 10014 is TRADE_RETCODE_INVALID_VOLUME, the official trade server return code for invalid volume in the request. Clamp volume to SYMBOL_VOLUME_MIN and SYMBOL_VOLUME_MAX, then align it to SYMBOL_VOLUME_STEP from the minimum. Also check any aggregate or directional volume limit exposed for the symbol. Read MqlTradeResult.retcode after OrderSend because a successful function return does not by itself mean that the order was executed.

Open MQL5 Coding AgentReview the diagnostic example

Open the Coding Agent and choose MQL5 from the language menu.

Check retcode 10014.mq5
double AlignVolume(const string symbol,const double requested)
  {
   double min=SymbolInfoDouble(symbol,SYMBOL_VOLUME_MIN);
   double max=SymbolInfoDouble(symbol,SYMBOL_VOLUME_MAX);
   double step=SymbolInfoDouble(symbol,SYMBOL_VOLUME_STEP);
   if(step<=0.0) return 0.0;

   double clipped=MathMax(min,MathMin(max,requested));
   return min+MathFloor((clipped-min)/step+1e-9)*step;
  }
  • Official code: TRADE_RETCODE_INVALID_VOLUME
  • Meaning: Invalid volume in the request
  • Layer: trade server response
  • Verify: MqlTradeResult.retcode

What error 10014 actually reports

The code belongs to MqlTradeResult.retcode, not to the compiler error list and not necessarily to GetLastError. The trade server uses 10014 to report invalid volume in the request.

Keep the request, the boolean returned by OrderSend, result.retcode, result.comment, and the symbol properties in the same log record. That separates a client-side request failure from a server-side rejection.

Inspect the request before changing the strategy

Use the smallest failing order and compare every broker-sensitive value with the current symbol and account. Do not hide the error by retrying unchanged input.

  • Read SYMBOL_VOLUME_MIN, SYMBOL_VOLUME_MAX, and SYMBOL_VOLUME_STEP.
  • Reject zero, negative, NaN, or infinite volume before OrderCheck.
  • Avoid rounding only by decimal places because the step may not be a power of ten.
  • Recalculate risk-based volume when price, stop distance, or account values change.

Repair and verify

Clamp volume to SYMBOL_VOLUME_MIN and SYMBOL_VOLUME_MAX, then align it to SYMBOL_VOLUME_STEP from the minimum. Also check any aggregate or directional volume limit exposed for the symbol.

Run OrderCheck with the completed request, log its retcode and comment, then send only if the check is acceptable. OrderCheck improves diagnostics but does not guarantee execution.

Use a focused diagnostic

The helper aligns from the broker minimum instead of assuming a decimal precision. Validate the returned value and risk calculation before using it in a request.

A valid request can still be rejected or filled differently by the trade server. Check the returned retcode, test with the broker symbol and account, and review risk before any live order.

Check retcode 10014.mq5
double AlignVolume(const string symbol,const double requested)
  {
   double min=SymbolInfoDouble(symbol,SYMBOL_VOLUME_MIN);
   double max=SymbolInfoDouble(symbol,SYMBOL_VOLUME_MAX);
   double step=SymbolInfoDouble(symbol,SYMBOL_VOLUME_STEP);
   if(step<=0.0) return 0.0;

   double clipped=MathMax(min,MathMin(max,requested));
   return min+MathFloor((clipped-min)/step+1e-9)*step;
  }
Where Pineify fits

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A practical verification workflow

  1. 1

    Capture the complete result

    Log the OrderSend return value, result.retcode, result.comment, symbol, order type, volume, price, stops, and filling mode. Confirm that the retcode is 10014.

  2. 2

    Read current constraints

    Query the symbol and account immediately before building the request. Broker constraints can differ between symbols and sessions.

  3. 3

    Change the invalid field

    Clamp volume to SYMBOL_VOLUME_MIN and SYMBOL_VOLUME_MAX, then align it to SYMBOL_VOLUME_STEP from the minimum. Also check any aggregate or directional volume limit exposed for the symbol.

  4. 4

    Check, send, and retest

    Call OrderCheck, submit the corrected request, then reproduce it in Strategy Tester and a demo account before considering live use.

Frequently asked questions

What does MQL5 error 10014 mean?

It is TRADE_RETCODE_INVALID_VOLUME, the official MQL5 trade server return code for invalid volume in the request.

Is 10014 a GetLastError code?

Treat it as a trade server return code when it appears in MqlTradeResult.retcode. GetLastError reports the terminal runtime error layer, which is a separate diagnostic channel.

Does OrderSend returning true mean the trade executed?

No. The official OrderSend reference says true means the request passed basic checks and was accepted for processing. Inspect result.retcode and subsequent trade events to determine the outcome.

Last verified against the linked official references on . Compile and test the final source in the MetaTrader 5 build, broker, symbol, and account environment you plan to use.

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