OrderCancelRequest (35=F) to cancel an active order.
Use OrderCancelReplaceRequest (35=G) to amend quantity or price for an active order.
Cancel request fields
| Tag | Name | Req | Type | Description |
|---|---|---|---|---|
41 | OrigClOrdID | Y | String | Original client order identifier of the order being cancelled. |
11 | ClOrdID | Y | String | New client identifier for the cancel request. |
55 | Symbol | Y | String | Symbol code of the original order. |
54 | Side | Y | Char | Original order side. Use 1=Buy or 2=Sell. |
60 | TransactTime | Y | UTCTimestamp | Time when the cancel request is created. |
Cancel response flow
| Step | Response |
|---|---|
| Cancel request is invalid | OrderCancelReject (35=9) with the current order status and rejection detail. |
| Cancel request is accepted for processing | ExecutionReport (35=8) with OrdStatus (39)=6 and ExecType (150)=6 for pending cancel. |
| Cancel succeeds | ExecutionReport (35=8) with OrdStatus (39)=4 and ExecType (150)=4 for canceled. |
| Cancel fails after acceptance | OrderCancelReject (35=9) with the current order status and rejection detail. |
Replace request fields
| Tag | Name | Req | Type | Description |
|---|---|---|---|---|
41 | OrigClOrdID | Y | String | Original client order identifier of the order being amended. |
11 | ClOrdID | Y | String | New client identifier for the replace request. |
55 | Symbol | Y | String | Symbol code. This value must match the original order. |
54 | Side | Y | Char | Order side. This value must match the original order. |
60 | TransactTime | Y | UTCTimestamp | Time when the replace request is created. |
38 | OrderQty | Y | Qty | New total order quantity. |
40 | OrdType | Y | Char | Order type. This value is required in the message and cannot change the original order type. |
44 | Price | Y | Price | New order price. |
59 | TimeInForce | N | Char | Order validity. This value cannot change the original validity for unsupported combinations. |
200 | MaturityMonthYear | N | Char | Contract month in YYYYMM format when required by the symbol contract. |
167 | SecurityType | N | Char | Security type when required. Use the value assigned for the session; FUT denotes futures. |
Replace response flow
| Step | Response |
|---|---|
| Replace request is invalid | OrderCancelReject (35=9) with the current order status and rejection detail. |
| Replace request contains no change in price or quantity | OrderCancelReject (35=9). |
| Replace request attempts to change order type or validity when not allowed | OrderCancelReject (35=9). |
| Replace request is accepted for processing | ExecutionReport (35=8) with OrdStatus (39)=E and ExecType (150)=E for pending replace. |
| Replace succeeds | ExecutionReport (35=8) with ExecType (150)=5 for replaced. OrdStatus (39) follows FIX 4.2 order-status precedence. |
| Replace fails after acceptance | OrderCancelReject (35=9) with the current order status and rejection detail. |
Priority handling
| Amendment | Priority behavior |
|---|---|
| Price changes | Matching priority is reset. |
| Quantity decreases only | Matching priority is retained. |
| Quantity increases | Matching priority is reset. |
Validation notes
| Rule | Description |
|---|---|
| Original order reference | OrigClOrdID (41) must reference an order that can be cancelled or amended. |
| One pending action | A new cancel or replace request is rejected when the target order already has a pending cancel or replace request. |
| Immutable fields | Symbol (55), Side (54), and the original order identity must remain unchanged. |
| Completed orders | Filled, cancelled, rejected, or expired orders cannot be cancelled or amended. |
| Session restrictions | Cancel and replace requests are permitted only in trading-session states that allow the action. |