Vero OMS Docs

Use NewOrderSingle (35=D) to submit a new order. The client order identifier must be unique within the trading date.

NewOrderSingle fields

Tag	Name	Req	Type	Description
`1`	`Account`	Y	String	Trading account number.
`11`	`ClOrdID`	Y	String	Client order identifier. The value must be unique for the trading date.
`55`	`Symbol`	Y	String	Tradable symbol code.
`40`	`OrdType`	Y	Char	FIX order type. See the order type mapping table.
`44`	`Price`	N	Price	Order price. Required for limit orders and price-based conditional orders.
`59`	`TimeInForce`	Y	Char	Order validity. See the order type mapping table.
`54`	`Side`	Y	Char	Order side. Use `1=Buy` or `2=Sell`.
`60`	`TransactTime`	Y	UTCTimestamp	Time when the order request is created.
`38`	`OrderQty`	Y	Qty	Order quantity.
`99`	`StopPx`	N	Price	Stop trigger price for stop-limit and trailing-stop orders. For sell orders, `StopPx >= Price`. For buy orders, `StopPx <= Price`.
`389`	`DiscretionOffset`	N	PriceOffset	Trailing step offset for trailing-stop orders. The value must be greater than or equal to `0`.

Order type mapping

Unsupported combinations are rejected.

`TimeInForce (59)`	`OrdType (40)=1` market	`OrdType (40)=2` limit	`OrdType (40)=5` market on close
`3` Immediate or cancel	`MAK`	Not supported	Not supported
`4` Fill or kill	`MOK`	Not supported	Not supported
`0` Day	`MTL`	`LO`	`ATC`
`2` At the opening	`ATO`	Not supported	Not supported

Order behavior

Order type	Behavior
`ATO`	Accepted for the opening auction when permitted by the trading session. Unmatched or remaining quantity is cancelled at the end of the opening auction.
`ATC`	Accepted for the closing auction when permitted by the trading session. Unmatched or remaining quantity is cancelled at the end of the closing auction.
`LO`	Limit order. Requires `Price (44)`.
`MTL`	Market-to-limit order. If a contra order exists, the order matches at the best available price and any remaining quantity becomes a limit order at the matched price. If no contra order exists, the order is cancelled.
`MAK`	Market order with immediate-or-cancel behavior.
`MOK`	Market order with fill-or-kill behavior.
Conditional stop limit	Waits until the stop condition is met, then submits the order to the market.
Conditional trailing stop	Adjusts the stop level by the trailing offset while pending, then submits the order when the condition is met.

MTL orders are valid only in continuous trading sessions. MinQty (110) defaults to 1; other values are not supported in this contract. Orders remain valid only within the trading date. Non-matched orders are cancelled after market close.

Conditional orders

Type	Required fields	Pending status	Activation behavior	Amendment while pending	Amendment after activation
Stop limit	`OrdType (40)=4`, `Price (44)`, `StopPx (99)`	`OrdStatus (39)=A`, `ExecType (150)=A`	When the stop condition is met, the service sends the order to market and reports `OrdStatus (39)=0`, `ExecType (150)=0`.	You may change `Price (44)`, `OrderQty (38)`, and `StopPx (99)`.	You may change only `Price (44)` and `OrderQty (38)`.
Trailing stop	`OrdType (40)=4`, `Price (44)`, `StopPx (99)`, `DiscretionOffset (389)`	`OrdStatus (39)=A`, `ExecType (150)=A`	When the stop level changes, the service sends `ExecType (150)=5` with the new `Price (44)`. When triggered, the order is sent to market.	You may change `Price (44)`, `OrderQty (38)`, `StopPx (99)`, and `DiscretionOffset (389)`.	You may change only `Price (44)` and `OrderQty (38)`.

For stop-loss execution design, a sell stop may use StopPx = Price + spread. A buy stop may use StopPx = Price - spread. The spread must be greater than or equal to 0.

Reject behavior

Invalid orders are rejected with ExecutionReport (35=8), OrdStatus (39)=8, and ExecType (150)=8. Common reject reasons include invalid price, disallowed order type for the session, insufficient available limit, position limit, and single-order quantity greater than 500. Accepted orders receive ExecutionReport (35=8), OrdStatus (39)=0, and ExecType (150)=0, unless the order remains pending as a conditional order.

Trading-session permission matrix

Legend:

Marker	Meaning
`P`	Permitted and remains pending.
`A`	Permitted and activated or sent to market.
`A*`	Permitted only while the order is pending.
`x`	Not permitted.

Session state	Action	`ATO`	`LO`	`MTL`	`MAK`	`MOK`	`ATC`	Conditional
Pre-opening	New order	`P`	`P`	`P`	`P`	`P`	`P`	`P`
Pre-opening	Cancel	`P`	`P`	`P`	`P`	`P`	`P`	`P`
Pre-opening	Modify	`P`	`P`	`P`	`P`	`P`	`P`	`P`
Opening auction	New order	`A`	`A`	`P`	`P`	`P`	`P`	`A`
Opening auction	Cancel	`x`	`x`	`P`	`P`	`P`	`P`	`A*`
Opening auction	Modify	`x`	`x`	`P`	`P`	`P`	`P`	`A*`
Continuous 1	New order	`x`	`A`	`A`	`A`	`A`	`P`	`A`
Continuous 1	Cancel	`x`	`A`	`A`	`x`	`x`	`P`	`A*`
Continuous 1	Modify	`x`	`A`	`A`	`x`	`x`	`P`	`A*`
Intermission	New order	`x`	`P`	`P`	`P`	`P`	`P`	`P`
Intermission	Cancel	`x`	`P`	`P`	`P`	`P`	`P`	`P`
Intermission	Modify	`x`	`P`	`P`	`P`	`P`	`P`	`P`
Continuous 2	New order	`x`	`A`	`A`	`A`	`A`	`P`	`A`
Continuous 2	Cancel	`x`	`A`	`A`	`x`	`x`	`P`	`A*`
Continuous 2	Modify	`x`	`A`	`A`	`x`	`x`	`P`	`A*`
Closing auction	New order	`x`	`A`	`x`	`x`	`x`	`A`	`A`
Closing auction	Cancel	`x`	`x`	`x`	`x`	`x`	`x`	`A*`
Closing auction	Modify	`x`	`x`	`x`	`x`	`x`	`x`	`A*`
Market closed	New order	`x`	`x`	`x`	`x`	`x`	`x`	`x`
Market closed	Cancel	`x`	`x`	`x`	`x`	`x`	`x`	`x`
Market closed	Modify	`x`	`x`	`x`	`x`	`x`	`x`	`x`

​NewOrderSingle fields

​Order type mapping

​Order behavior

​Conditional orders

​Reject behavior