first I want to say that I have less than basic programming skills. Anyway...I have managed to build my own application with some little scripts. But there is one thing I can not solve:

In a form I am using a subform where I enter more than one lines. One of the fields is a decision box.

Now I want to manage that only one decision box can be active. So if I check e. g. the box in a line all boxes in the other lines should be unmarked (if marked).

Any idea how to script that?

I hope the question is not too confusing...I am not a native english speaker.

Thanks in advance to everybody for helping.