Audience
For MQL5 builders whose EA compiles but order placement fails with unsupported filling mode, invalid fill, or retcode 10030.
MT5 execution blocker
Fix unsupported filling mode without guessing FOK, IOC, or RETURN.
Fix MT5 unsupported filling mode and retcode 10030 errors by reading symbol filling flags, choosing supported FOK/IOC/RETURN behavior, and logging broker execution evidence.
Common filling-mode evidence
retcode=10030 unsupported filling mode TRADE_RETCODE_INVALID_FILL failed market buy [Unsupported filling mode] ORDER_FILLING_FOK rejected
These are execution-policy failures. Treat them as symbol and broker constraint evidence before changing strategy logic.
Debug retcode 10030 unsupported filling mode
Read SYMBOL_FILLING_MODE before OrderSend
Use symbol-aware CTrade filling setup
Route opt-in source as filling-mode fixer interest
Problem
Unsupported filling mode usually means the EA hard-coded an order filling policy that the current symbol, broker, or account mode does not support.
Outcome
Workfusionapp keeps the repair path narrow: read symbol filling rules, select a supported policy, keep CTrade setup explicit, log the chosen mode, and retest manually with retcode evidence.
Support path
One problem, one fix path.
Start with the concrete blocker, keep the full EA context attached, then move to a reviewable output.
1. Stop hard-coding filling policy first
Hard-coded FOK, IOC, or RETURN can pass on one symbol/account and fail on another. Read the current symbol rules before sending the request.
2. Use symbol-aware setup
For CTrade flows, call SetTypeFillingBySymbol and log the result. For manual MqlTradeRequest flows, inspect SYMBOL_FILLING_MODE and choose only an allowed policy.
3. Keep execution evidence attached
Log symbol, account mode, request type_filling, execution mode, retcode, broker comment, and whether the policy came from symbol rules.
Workflow
From retcode 10030 to one symbol-compatible fill policy.
The fix is not to try every filling mode until one order passes. The fix is to prove the symbol rules, choose a supported mode, and keep the result logged for the next manual test.
Step 1
Paste the retcode and request block
Step 2
Read symbol filling flags
Step 3
Select supported filling policy
Step 4
Retest manually in Strategy Tester or demo
Filling-mode handoff
Route the fill rejection into the right execution check.
Open the guide that matches the failed order policy, then run the free desk with retcode, symbol flags, request filling mode, account type, and broker comment.
Unsupported filling guide
Use this when the order is rejected with invalid fill, unsupported filling mode, or retcode 10030.
CTrade setup guide
Use this when filling mode is tied to missing CTrade setup, inconsistent trade object scope, or unlogged result retcodes.
Execution audit trail
Use this when the EA needs repeatable order evidence before changing risk, signal, or broker-condition logic.
Send me the filling-mode repair workflow
Opt in only if your MT5 EA compiles but order placement fails with unsupported filling mode, invalid fill, or retcode 10030. This captures the filling-mode source for conversion measurement.
Intent locked: Paste compiler errors
Choose the workflow you want, then opt in only if you want Workfusionapp updates.
Should I try FOK, IOC, and RETURN until something works?
No. Read the symbol filling flags and choose a supported policy. Blind retries can hide broker-condition bugs.
Does fixing filling mode prove the EA is ready?
No. It only fixes one execution-policy blocker. Risk, stops, volume, signal logic, and manual testing remain separate checks.
Does this require broker credentials?
No. Use code, symbol settings, Strategy Tester or demo logs, request fields, broker comments, and retcodes. Workfusionapp does not need broker login.