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MQL5 Expert Advisor Bug Report Checklist

A reproducible MQL4 or MQL5 bug report format that helps separate source-code logic, broker constraints and terminal configuration.

The checklist

  1. 1

    Editable source

    Include the MQ4 or MQ5 files and every non-standard include or custom indicator required to compile.

  2. 2

    One primary issue

    Describe the single highest-priority fault before adding unrelated improvements.

  3. 3

    Expected behaviour

    State exactly what the EA, indicator or script should do in the reproducible case.

  4. 4

    Actual behaviour

    State what happened instead, including visible values and the time of the event.

  5. 5

    Reproduction steps

    List symbol, timeframe, date range, input set and the shortest sequence that triggers the issue.

  6. 6

    Logs

    Include the relevant Experts and Journal lines around the failure, preserving return codes and timestamps.

  7. 7

    Broker environment

    Provide account mode, digits, filling mode, volume step, stop level and terminal build when execution is involved.

  8. 8

    Screenshots or tester evidence

    Mark the expected event and actual event without relying on the image as the only specification.

  9. 9

    Recent changes

    Identify the last known working version and what changed before the issue appeared.

  10. 10

    Acceptance test

    Define the exact check that will prove the agreed repair is complete.

Common questions

Can an EX4 or EX5 file be repaired without source code?

Not as a normal source-code repair. Protected or compiled files should not be decompiled. A clean reimplementation requires a separate behavioural specification and authorization.

Why are broker details relevant to an EA bug?

Order filling, symbol digits, minimum volume, stop levels and account mode can change whether an otherwise valid trade request is accepted.

Is optimization included in a bug fix?

Not automatically. A bounded bug fix proves corrected behaviour for the agreed case. Strategy optimization and new features should be scoped separately.

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Mark Compile, Load, Initialize and Runtime in order, then copy a source-safe evidence brief without uploading code or credentials.

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