cbr-1.0.0/cbr.routing.yml

cbr.merge:
  path: /reuse/{source}/{target}
  defaults:
    _title: Reuse solution
    _form: Drupal\cbr\Form\ReuseForm
  requirements:
    _permission: 'cbr reuse'
  options:
    _admin_route: TRUE
    parameters:
      source:
        type: entity:node
        default: NULL
      target:
        type: entity:node
        default: NULL