Why is this not possible?
Any time you “format as” something, it converts the value to a text value. Looks like your particular setup at the moment requires a date value. You have “type of choices” set to date, but you’re formatting the value which makes it a text value which is causing your error.
Thank you for the explanation. In this case I really need the date value but it is not possible to format the date without changing the “type of choice” value to text. Did I get that right?
No. “termine” is a list of dates.
Try this:
Please do not pay attention to my choices source as user … it is just an example. Yours is termin’s termine 
Awesome, it works! Thanks for your support.
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