Thank you Tony,
Now I set the question to a minimum of 3 and a maximum of 3 and so far it works.
The problem that comes up now is that once you have made a choice and want to undo it, its not going. So in that case it counts for the maximum of three.

If this can be made working I have 2 extra questions:
1 is it possible to maximise and minimise that in each row 1 answer is choosen ?
2 The min and max item is as far is a understand only available in version 1.92. I am using Limeservice which has version 1.91 Maybe for an other topic ?
Thanks,
Peter

The problem that comes up now is that once you have made a choice and want to undo it, its not going.

This is true with any radio question. If you want the ability to uncheck, you will need to use an array-numbers question with the checkbox layout.

is it possible to maximise and minimise that in each row 1 answer is choosen ?

A radio array only allows one answer per row. If you use the checkbox option mentioned above, you will need to use JavaScript to limit one answer per row.

I am using Limeservice which has version 1.91

Then you will need to use JavaScript.

Attach a small sample survey with the array-numbers/checkbox question question and I'll give a little script to:
1) Limit to one answer per row
2) Limit to 3 rows answered
3) Require that 3 rows are answerd

Good morning Tony,
My apologies for my non reaction on your offer. I was abroad for a long time. Thanks for your reaction and offer. I have to study now all the changes and new possibilities of Limesurvey. It looks good so far.
Best regards, Peter

And you should really think about a upgrade. 1.91 is quite old and since then LS has advanced quite a bit and also a lot of bugs have been solved.

Hello Holch, thanks for your advice. I was not here for a long time. Now I am using the Limeservice and building seriously my first survey.
Have a nice day, Regards, Peter