I have a YAML file and I want to generate equivalent class of this YAML file by OpenAPI code generator (openapi-generator-maven-plugin). my YAML file is something like this:

penapi: 3.0.3
info:
  title: blah blah
  description: blah blah
  version: 1.0.0
components:
  schemas:
    Object1Model:
      description: requested array of object2
      type: object
      properties:
        object2Model:
          type: array
          items:
            $ref: '#/components/schemas/Object2Model'

    Object2Model:
      description: Object2 Model
      type: object
      required:
        - "field1"
        - "field2"
      properties:
        field1:
          description: field1
          type: string
        field2:
          description: field2
          type: string
        day1:
          $ref: "../../commons.yml#/definitions/weekday"
        day2:
          $ref: "../../commons.yml#/definitions/weekday"
paths: { }        

I have weekday enum in another file:

swagger: "2.0"
info:
  title: Commons file
  description: Common elements used across all of the REST APIs
  version: 1.0.0
paths: {}

definitions:
#  Weekday enum used to represent the weekdays.
  weekday:
    type: string
    enum:
      - MON
      - TUE
      - WED
      - THU
      - FRI
      - SAT
      - SUN
    description: Day of a week.
    example: FRI

and my YAML file referes correctly to this file. I want to use Weekday enum generated by Commons file and use existing enum, but OpenAPI generates it again. How can I avoid generating Weekday enum?