Thank you very much for help!

This was the solution and the survey runs fine.

However I observed a strange thing.

When I copied the condition in the "Question validation equation: " field, the logic test showed errors for this question. The same when I opened you .lss file and copied all from there.

If you or someone else, wants to look at this I can provide an .lss file with both versions (the question with copy&paste the equation by me) and the question in which you added the equation.

Please advice.

Can you attach an LSS file containing only those two questions?

Here it is.

I checked it by re-importing it and the error is shown.

I hope it is helpful.

Again, thanks for your support.

Just had a quick look.

Your validation equation:


but your codes are still SQ001.,...

Thanks for your reply and the lesson I learned.

I did not see that Y001 etc is the equivalent for SQ001.

Lesson learned for the future application of arrays.

You still should get your German checked out. You need to fix quite a couple of things there.

Thanks for the hint with German. Proof reading is coming up by a native speaker