> ## Documentation Index > Fetch the complete documentation index at: https://docs.vos.verolabs.co/llms.txt > Use this file to discover all available pages before exploring further. # Order entry > NewOrderSingle fields, supported order types, conditional order behavior, and trading-session permissions 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` |