- type: Textarea
      name: pdc
      label: Comments
      cols: 60
      rows: 4 
      constraints:
        - Required
          when:
            field: pd
            value: 1 

##</code><code>##

*.yml: YAML::XS::Load Error: The problem:

    mapping values are not allowed in this context

##</code><code>##

      constraints:
        - type: Required
          when:
            field: pd
            value: 1