Parameter reference lost

[cubahno]

In this document, the reference to parameter is lost in Schema, schema inlined.

openapi: 3.1.0
info:
  title: API
  version: 1.0.0
paths:
  /checkout:
    post:
      summary: Initiate a checkout
      operationId: initiateCheckout
      tags:
        - Checkout
      parameters:
        - $ref: '#/components/parameters/VersionHeader'
      responses:
        "200":
          description: Checkout successful

components:
  parameters: 
    VersionHeader:
      name: Version
      in: header
      required: true
      schema:
        type: string
        enum:
          - "2020-04-02"