oneOf with discriminator on path

[LienM]

As all different types of request bodies should be processed by the same function, I was hoping to do something the following minimal example:

  /api/{item_type}:
    post:
      parameters:
        - in: path
          name: item_type
          required: true
          schema:
            type: string  
      requestBody:
        $ref: '#/components/requestBodies/object'
        required: true
      responses:
        '201':
          description: Item created
components:
  requestBodies:
    object:
      content:
        application/json:
          schema:
            oneOf:
              - $ref: '#/components/schemas/Movie'
              - $ref: '#/components/schemas/Program'
            discriminator:
              propertyName: item_type
  schemas:
    Movie:
      type: object
    Program:
      type: object

Essentially, I want one function, to parse all item_types, but still ensure validation based on item_type in the path. However, I can create a Movie with the properties of Program.
Is this not the intended use? Or is there no discriminator validation on parameters specified in the path?

Thanks in advance.

[p1c2u]

@LienM Discriminator property is taken from schema. You can't get item_type from path parameter.