Thanks for the reply!
In the meantime I found out I was missing the line on top
add_action(‘after_setup_theme’,’kleo_my_match’);
in my code.
However, I have another question regarding compatibility matching:
I found out that the percentages of the multiple values fields (like multiple select or checkbox) only are added, if ALL SELECTIONS are identical.
I would like to change it in that way that only ONE SELECTION needs to be identical in order for the percentage to be added to the overall match percentage.
Basically change the formula from AND to AND/OR, I guess.
Is that possible?
Thanks!