[Koha] Where's the Dewey

Hi !!! I've my test instalation working, now I'm receiving feedback from my users. We've noticed that we can't see the Dewey of a biblio when we enter to the catalog. However, if with go to the database the dewey is asociated to MARC Field 90d, as I specified in the Parameters (Links MARC-Koha). How can I solve this? Andres