[Koha] Broowsing by subject - number of biblio records

[rafael.antonio at sapo.pt]

Browsing by subject allows us to find bib records using any authority  
list wich seems very useful.
But I have seen several KOHA 3.0 demos where the page Authority search  
results allways display 0 biblio records. I have tested and did some  
links between biblio and authority but it never changes. can anyone  
help to solve this question? Does we need to run any script?

Thanks,

Rafael Antonio