I always recommend to activate the survey.
Enter some well defined data (write down what you entered).
Investigate the answer table.
Afterwards you deactivate again.
Here you see this
Meaning there is no "Y" or blank in "Q1_other", but only the entered text.
This way you realize what you have to enter in the relevance equation.
As Denis said: Is it empty or not?
And you should insert the other mention in the question text of Q6
When you go to work by {Q1_other.NAOK}, how long does one trip take? (minutes)
Joffm