Upgrading Red Hat Satellite 6.8 to 6.9 fails with the error 'Validation failed: ERF42-3514 [Foreman::Exception]: Duplicated inputs detected: ["Days from Now"]'

Issue

• Unable to upgrade Satellite server.

• Upgrade from Satellite 6.8 to 6.9 is failed with the below error:

  rake aborted!
  ActiveRecord::RecordInvalid: Validation failed: ERF42-3514 
  [Foreman::Exception]: Duplicated inputs detected: ["Days from Now"]
  /opt/theforeman/tfm/root/usr/share/gems/gems/activerecord-6.0.3.4/lib/active_record/validations.rb:80:in `raise_validation_error'
  /opt/theforeman/tfm/root/usr/share/gems/gems/activerecord-6.0.3.4/lib/active_record/validations.rb:53:in `save!'