When you use “Select” Field (pull-down menu for choosing) you need to enter Options, which is fine. And when you put it in, plugin automatically creates “slugs” one line below – this is fine as well. But what is not fine is that, when you put Options with special characters (slavic, French,…:wink:, slug SKIPS that special character – this is really not fine.
What I suggest?
Transform a character to the closest match, for example:
č –> c
ž –> z
š –> s
é –> e
Or even better, try to implement UTF8 support – maybe I missed with this one but I think you’ve got the point.