I finally got it to work. I deleted all relationships and recreated them. After that it worked. Here is the final formula (perhaps might help anybody with a similar problem):
Code:
ifThen( kaufVorAblaufPos1, record\update('ArtCollectionWorks', werkeVermietung1Id, 'verleih', false); record\update('ArtCollectionWorks', werkeVermietung1Id, 'verkaufAbAtelier', true) );
My thanks go to Maximus (I begin to understand the avatar name
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