[Koha] Item issue

Hi all Koha 3.00.06 / ubuntu 10 We have some problems to see items in OPAC. We have loaded 365 records from a marc file. Items have the field 952 So we test to load a few bib revords with manual opcions for items, puting a non null value into the 952/9 subfield. This items after rebuild_zebra indexing are visible, but all the other have a value of 0 and they are not visible. In the import step all the ITEMS seem to be presents In the cataloging tab, the items are visible too. So... have we forget a step? Could we update database to have a value !=0 in the 952/9 subfield? Thanks a lot in advance