pm-4.1.x-dev/modules/pm_invoice/pm_invoice.links.action.yml

pm_invoice.type_add:
  title: 'Add Invoice type'
  route_name: entity.pm_invoice_type.add_form
  appears_on:
    - entity.pm_invoice_type.collection

pm_invoice.add_page:
  title: 'Add Invoice'
  route_name: entity.pm_invoice.add_page
  appears_on:
    - entity.pm_invoice.collection
    - view.pm_invoice.collection
    - entity.pm_project.canonical