Thank you very much for your reply. Unfortunately, I didn’t get any notification.
In the meanwhile I learned a lot about templates and in the end I placed a service template directly in the Action part of the automation, which is working fine as well.
service_template: >
{% if state_attr('cover.jalousie_links', 'current_position')|int <
states('input_number.limit_jalousie')|int %}
cover.close_cover
{% else %}
cover.stop_cover
{% endif %}
entity_id: cover.jalousie_links