# Cancel sales order

Use this operation to cancel an existing open sales order. Successful execution of this method will cancel the sales order in Wineshipping system. If the order cannot be cancelled for some reason standard HTTP Status Code and a reason will be returned.

Endpoint: POST /api/SalesOrder/CancelSalesOrder
Version: 3.1.3
Security: Authentication

## Request fields (application/json):

  - `Authentication` (object, required)
    Credentials are required for all API operations.

  - `Authentication.UserKey` (string, required)
    Example: "C445598CB576468EA35FBB22C55584EF"

  - `Authentication.Password` (string, required)
    Example: "AF63FDAC1E704DC1AC9460F669ABF107"

  - `Authentication.CustomerNo` (string, required)
    Example: "10703"

  - `OrderNumber` (string)

  - `TransactionReferenceNumber` (string)