Not working properly after upgrade from D6 to D7

Hi there,

I've been using this module for over a year in D6 and always worked fine.

Now, after upgrading the site to D7 the module isn't doing all the checking it's supposed to.

I've got a combination of 5 different fields that mustn't match within a content type. They are 2 text fields, 2 taxonomy reference fields and a node reference field.

I'm getting content flagged as "duplicated" when only 3 of those fields match.

¿?¿?¿? Any idea of what may be going wrong?