Thank you for the response, doug_schulze 

Then, if I'm understanding well, the Pattern could overwrite or take precedence on the on classification script? 

If this is true, do you think that I have to look for all steps on the related Pattern in order to find out if there is one where my short_description is there? Taking a quick look of the discovery logs it seems no..... 

Thank you for the sharing of your experience

Cheers

Davide Gandolfi