I would like to do pretty much the direct opposite to the not() function.
I want to disable a checkbox if another checkbox is checked. The other way round (ACTIVATING when checked) is easy and you find a lot of tutorials telling you how to use the not() function for that.
I have the following situation:
There are two checkboxes. As soon as one get checked, the other should be disabled (and the other way round).
How can I achive this? This should be possible with a simple rule, shouldn't it?
Thanks in advance,