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THEMA: Set variable minimum year

Set variable minimum year 1 Jahr 8 Monate her #88144

I would like to set for a date/time question with the format yyyy (Date_2) a minimum year based on the answer of another date/time question (Date_1, also yyyy).
I already tried to enter in the minimum year field of Date_2:
{Date_1.NAOK}

and
{substr(Date_1.NAOK,0,4)}

but both expressions don't work.

Is there a way to make this work?
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