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Hello,
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I have read data in the group fields:
Beobs.beo_id
Beobs.beobachtung
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I will be shown correct records.
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In the displayed table (articles_list) the date is linked {view: article_view_link}.
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What has to be the URL in the link, so that I come to the "beo_id" with the correct "beobachtung"?
beo_id = {var: articles_list.row.Beobs.beo_id} shows me too many records.
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many Greetings
F.

On your view event, you need to have a read data that reads a single entry (so "return first matching") based on the ID you pass in your link.