[Koha] Z39.50 searching by Publisher

Is it possible to make a searching in Z39.50 mask also by publisher? in file z3950_search.tt I've add a: <li><label for="biblioitems.publishercode">Publisher: </label> <input type="text" id="biblioitems.publishercode" name="biblioitems.publishercode" value="[% biblioitems.publishercode %]" /></li> so the z39.50 mask has a new field, but the results mask doesn't filter with it --