# Cancel purchase order

This operation is used to cancel a purchase order request. A transaction reference identifier is required to post using this operation. A transaction reference identifier will be returned upon use of the operation. Store this identifier in your application and systems as applicable. This reference ID is available in the event a problem occurs with the associated request. Successful execution of this method will cancel an open Purchase Order in Wineshipping's system and will return a transaction reference identifier. 

Endpoint: POST /api/InventoryMovement/CancelPurchaseOrder
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"

  - `CustomerReferenceNo` (string, required)