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FIX application rejects use ExecutionReport (35=8) or OrderCancelReject (35=9). Session-level rejects use Reject (35=3) or Logout (35=5). Text (58) may include a pipe-delimited diagnostic value:

{source}|{errorCode}|{errorMessage}

Treat errorCode as the actionable code and errorMessage as diagnostic text. The exact text can change without a schema change.

Reject-code families

Range	Area	Handling guidance
`-100000` to `-100099`	FIX request validation	Correct the FIX message fields, identifiers, or order attributes before resubmitting.
`-131000` to `-135999`	Order, cancel, and modify business validation	Review market state, order eligibility, duplicate identifiers, and trading rules.
`-132000` to `-132499`	Account, quantity, price, and instrument validation	Review account status, price bands, quantity limits, instrument status, and order type.
`-200000` to `-209999`	Order-entry rejects	Use `Text (58)` for the exact order-entry reason.
`-210000` to `-210500`	Business-message rejects	Review message type, required fields, and application availability.
`-220000` to `-229999`	Cancel and replace rejects	Review target order status, replace values, pending actions, and session restrictions.
`-230000`	General order reject	Treat as a general order rejection and review `Text (58)`.
`-420000` to `-420999`	Market and order-type constraints	Review order type, session state, price limits, quantity rules, and instrument eligibility.
`-900000` to `-913999`	Connectivity, risk, and venue response	Review connection status, risk limits, market availability, and venue rejection text.
Positive codes	Operational order state	Review the target order state, product status, and operational restrictions.

Common validation codes

Code	Meaning	Client action
`-100000`	Missing one of the mandatory fields: `Account (1)`, `ClOrdID (11)`, `Symbol (55)`, `OrdType (40)`, `Side (54)`, or `OrderQty (38)`.	Add the missing field and resend with a valid `ClOrdID (11)`.
`-100001`	Duplicate `ClOrdID (11)`.	Generate a new client order identifier.
`-100002`	Incorrect `ClOrdID (11)`.	Verify identifier format and uniqueness rules.
`-100003`	Unknown or invalid `OrdType (40)`, `TimeInForce (59)`, or `Price (44)`.	Use a supported order type mapping.
`-100005`	Invalid order request.	Review all required order fields and trading-session constraints.
`-100007`	Incorrect `Account (1)`.	Use an account assigned to the FIX session.
`-100008`	Incorrect `Symbol (55)`.	Use a valid tradable symbol.
`-100009`	Missing mandatory `ClOrdID (11)` or `OrigClOrdID (41)`.	Add the missing identifier.
`-100010`	Missing mandatory `ClOrdID (11)`, `OrigClOrdID (41)`, `Price (44)`, or `OrderQty (38)`.	Add the missing cancel or replace field.
`-100011`	Incorrect `OrigClOrdID (41)`.	Reference an active original order.
`-100013`	Cancel failed because a cancel or modify request is already pending.	Wait for the pending request result before submitting another action.
`-100014`	Modify failed because a cancel or modify request is already pending.	Wait for the pending request result before submitting another action.
`-100015`	Modify failed because the order has no change.	Change price or quantity before resubmitting.
`-100016`	Modify failed because order type or validity cannot be changed.	Keep immutable fields unchanged.
`-100018`	Modify or cancel is not allowed in the current market session.	Retry only in a session state that permits the action.
`-100019`	Modify or cancel failed because the order is completed.	Do not modify or cancel completed orders.
`-100023`	Invalid stop price.	Correct `StopPx (99)` according to side and trigger rules.
`-100024`	Invalid `DiscretionOffset (389)`.	Use a non-negative trailing offset.
`-100025`	Missing price.	Provide `Price (44)` when the order type requires a price.
`-100026`	Conditional order fields can be changed only while the order is pending.	Amend condition fields before activation.

Common order and market codes

Code	Meaning	Client action
`-131001`	Symbol does not exist.	Verify `Symbol (55)`.
`-131002`	Market is closed.	Submit only during an allowed session state.
`-131003`	Quantity exceeds limit.	Reduce `OrderQty (38)`.
`-131006`	Duplicate order identifier.	Use a new `ClOrdID (11)`.
`-131011`	Unsupported order type.	Use a supported order type mapping.
`-131013`	Invalid quantity.	Correct quantity lot size and minimum rules.
`-131018`	Price increment is invalid.	Correct `Price (44)` to the valid tick size.
`-132000`	No credit limit is defined for the participant and account.	Confirm account setup before submitting orders.
`-132002`	Order quantity is below the lower threshold.	Increase quantity to the permitted minimum.
`-132003`	Order quantity is above the upper threshold.	Reduce quantity to the permitted maximum.
`-132004`	Price is outside the permitted band.	Correct `Price (44)` to the allowed range.
`-132005`	`MTL` orders are only valid in open continuous periods.	Submit `MTL` only in an allowed continuous session.
`-132006`	Fill-or-kill orders are only valid in open continuous periods.	Submit `MOK` only in an allowed continuous session.
`-132007`	Immediate-or-cancel orders are only valid in open continuous periods.	Submit `MAK` only in an allowed continuous session.
`-132008`	Trading account is disabled.	Use an enabled account.
`-132200`	Invalid instrument.	Verify symbol eligibility and contract status.
`-132300`	Unsupported message type.	Send only documented FIX messages.
`-132400`	Order submission is not allowed in the current market period.	Submit in an allowed session state.
`-420025`	The specified time validity is not allowed.	Correct `TimeInForce (59)`.
`-420045`	Illegal order quantity.	Correct `OrderQty (38)`.
`-420131`	Price is outside allowed limits for the instrument.	Correct `Price (44)`.
`-420193`	Fill-or-kill orders are not allowed in this session state.	Submit `MOK` only when permitted.
`-420199`	Fill-and-kill orders are not allowed in this session state.	Submit `MAK` only when permitted.
`-420211`	Limit orders are not allowed in this session state.	Submit `LO` only when permitted.
`-420217`	Market orders are not allowed for this instrument.	Use an order type supported by the instrument.
`-420219`	Market orders are not allowed in this session state.	Submit market orders only when permitted.
`-420251`	`MTL` is not allowed for this instrument.	Use another supported order type.
`-420253`	`MTL` is not allowed in the current trading state.	Submit `MTL` only when permitted.

Common cancel and replace codes

Code	Meaning	Client action
`-133000`	Cancel rejected because the order was sent too late.	Review order state before retrying.
`-133001`	Cancel rejected because the order is not determined.	Confirm the target order exists and is active.
`-133003`	Cancel rejected because the order is pending.	Wait for the pending state to resolve.
`-133006`	Cancel rejected because the order identifier is duplicated.	Use a new `ClOrdID (11)` for the cancel request.
`-133007`	Cancel is not allowed in the current market period.	Retry only in an allowed session state.
`-134000`	Modify rejected because the order was sent too late.	Review order state before retrying.
`-134001`	Modify rejected because the order is not determined.	Confirm the target order exists and is active.
`-134003`	Modify rejected because the order is pending.	Wait for the pending state to resolve.
`-134006`	Modify rejected because the order identifier is duplicated.	Use a new `ClOrdID (11)` for the replace request.
`-134007`	Modify is not allowed in the current market period.	Retry only in an allowed session state.

Connectivity, risk, and operational codes

Code	Meaning	Client action
`-900000`	Trading connection is disconnected.	Wait for connectivity recovery before resubmitting.
`-900001`	Risk-rule check failed.	Review account limit, position limit, and available balance.
`-913001`	Market is currently unavailable.	Retry after market connectivity is restored.
`-913002`	Request waited longer than the configured processing window.	Check the final order state before resubmitting.
`-913004`	No limits are configured for the account or contract type.	Confirm account and contract setup.
`-913007`	Buy stop price must be above the last traded price.	Correct `StopPx (99)`.
`-913008`	Sell stop price must be below the last traded price.	Correct `StopPx (99)`.
`-913018`	Order rejected because of insufficient margin.	Review available margin before resubmitting.
`-913019`	Invalid `SecurityDesc (107)`.	Correct security description when the field is required.
`-913999`	Venue action rejected.	Review `Text (58)` for the specific rejection reason.
`1001`	Target order is completed.	Do not cancel or modify completed orders.
`1002`	Target order is not active in the market.	Confirm the current order state before submitting an action.
`1003`	Trading service is not available.	Retry after service availability is restored.
`1006`	Product is unavailable.	Verify symbol and product status.
`3001`	Lot size limit exceeded.	Correct `OrderQty (38)`.
`3002`	Single-order limit exceeded.	Reduce `OrderQty (38)`.
`3003`	Accumulated order limit exceeded.	Reduce order size or review limits.
`3004`	Position order limit exceeded.	Review position limits.
`3011`	Margin check rejected the order.	Review available margin.
`3024`	Order is not accepted in this period.	Submit in an allowed session state.
`3025`	Amendment is not allowed in this session.	Retry only when amendment is permitted.
`3027`	Market order is not supported for the product.	Use another supported order type.
`3028`	Order is outside the trading session.	Submit during an allowed session.

​Reject-code families

​Common validation codes

​Common order and market codes

​Common cancel and replace codes

​Connectivity, risk, and operational codes

Reject-code families

Common validation codes

Common order and market codes

Common cancel and replace codes

Connectivity, risk, and operational codes