[Resolved] Preset parent relationship of child form inside parent's view

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[andreasK-10]

Tell us what you are trying to do?
On a parent's list view I added a form on each listed parent item to add a child post. Since the form is shown 'inside' the listed parent item the relationship should be preset. Because of the obvious relationship there is no need to have a select-input. So far I managed to have a correctly preselected select-input with:
[cred_field field='_wpcf_belongs_kurs_id' value='[wpv-post-id id="$kurs"]' max_results='1' readonly='true' required='true']
(readonly and max_results don't have an effect)
I tried to insert a <input type='hidden' name='_wpcf_belongs_kurs_id' value='[wpv-post-id id="$kurs"]'> to pass the needed parent's ID, but the saved (child-)post doesn't apply the relationship.
It would be better to have a fixed parent's ID on the child form, instead of a preselected select-input. Just hiding the select-input makes it too easy to change the relationship with the browser's debugger...

Is there any documentation that you are following?
No.

Is there a similar example that we can see?
Don't know. But the use-case should be obvious.

What is the link to your site?
Doesn't play a role.

[andreasK-10]

I managed to solve it by myself. Just used the [cred-generic-field] shortcode to generate a hidden input field with the needed name and value.
The idea came from: https://toolset.com/forums/topic/linking-a-custom-post-to-related-user-parent-posts/