## Cancel Position Instruction

`PositionCancelPositionInstructionResponse v1().positions().cancelPositionInstruction(PositionCancelPositionInstructionParamsparams, RequestOptionsrequestOptions = RequestOptions.none())`

**delete** `/v1/accounts/{account_id}/positions/instructions/{instruction_id}`

Cancel an outstanding position instruction by its server-assigned `id`.
Returns the updated instruction with status `CANCEL_REQUESTED`. The
terminal `CANCELLED` or `CANCEL_FAILED` state arrives asynchronously and
is observable via subsequent GETs.

### Parameters

- `PositionCancelPositionInstructionParams params`

  - `long accountId`

  - `Optional<String> instructionId`

### Returns

- `class PositionCancelPositionInstructionResponse:`

  - `PositionInstruction data`

    A position instruction and its current lifecycle state.

    - `String id`

      Server-assigned id. Used as the path parameter on cancel.

    - `long accountId`

      Account the instruction belongs to.

    - `String instructionId`

      Caller-supplied idempotency key echoed from the submit request; the
      server-assigned fallback when none was supplied.

    - `PositionInstructionType instructionType`

      The action this instruction requests.

      - `EXERCISE("EXERCISE")`

      - `DO_NOT_EXERCISE("DO_NOT_EXERCISE")`

      - `CONTRARY_EXERCISE("CONTRARY_EXERCISE")`

    - `String instrumentId`

      Identifier of the options contract this instruction acts on.

    - `String quantity`

      Number of contracts included in the instruction.

    - `PositionInstructionStatus status`

      Current lifecycle status.

      - `SENT("SENT")`

      - `ACCEPTED("ACCEPTED")`

      - `REJECTED("REJECTED")`

      - `ENGINE_REJECTED("ENGINE_REJECTED")`

      - `CANCEL_REQUESTED("CANCEL_REQUESTED")`

      - `CANCELLED("CANCELLED")`

      - `CANCEL_FAILED("CANCEL_FAILED")`

      - `UNKNOWN("UNKNOWN")`

    - `String symbol`

      Options symbol (OSI) for display.

    - `Optional<String> acceptedQuantity`

      Number of contracts accepted by the clearing venue. Populated once
      the instruction reaches `ACCEPTED`.

    - `Optional<LocalDateTime> createdAt`

      When the instruction was first accepted by the service.

    - `Optional<String> rejectionReason`

      Human-readable explanation populated on any non-success terminal
      status — `REJECTED`, `ENGINE_REJECTED`, or `CANCEL_FAILED`. On a
      `207 Multi-Status` batch submit the top-level `error` field
      summarizes the batch; per-row detail continues to live here.

    - `Optional<LocalDateTime> updatedAt`

      When the instruction's lifecycle state last changed.

### Example

```java
package com.clear_street.api.example;

import com.clear_street.api.client.ClearStreetClient;
import com.clear_street.api.client.okhttp.ClearStreetOkHttpClient;
import com.clear_street.api.models.v1.positions.PositionCancelPositionInstructionParams;
import com.clear_street.api.models.v1.positions.PositionCancelPositionInstructionResponse;

public final class Main {
    private Main() {}

    public static void main(String[] args) {
        ClearStreetClient client = ClearStreetOkHttpClient.builder()
            .fromEnv()
            .apiKey("My API Key")
            .build();

        PositionCancelPositionInstructionParams params = PositionCancelPositionInstructionParams.builder()
            .accountId(0L)
            .instructionId("182bd5e5-6e1a-4fe4-a799-aa6d9a6ab26e")
            .build();
        PositionCancelPositionInstructionResponse response = client.v1().positions().cancelPositionInstruction(params);
    }
}
```

#### Response

```json
{
  "metadata": {
    "request_id": "request_id",
    "next_page_token": "U3RhaW5sZXNzIHJvY2tz",
    "page_number": 0,
    "previous_page_token": "U3RhaW5sZXNzIHJvY2tz",
    "total_items": 0,
    "total_pages": 0
  },
  "error": {
    "code": 400,
    "message": "Order quantity must be greater than zero",
    "details": [
      {
        "foo": "bar"
      }
    ]
  },
  "data": {
    "id": "0195f6d0-a1b2-7c3d-8e4f-5a6b7c8d9e02",
    "account_id": 122503,
    "instruction_id": "ui-20260424-001",
    "instruction_type": "EXERCISE",
    "instrument_id": "0195f6d0-a1b2-7c3d-8e4f-5a6b7c8d9e02",
    "quantity": "1",
    "status": "SENT",
    "symbol": "AAPL  280121C00195000",
    "accepted_quantity": null,
    "created_at": "2026-04-24T14:30:00Z",
    "rejection_reason": null,
    "updated_at": "2026-04-24T14:30:00Z"
  }
}
```