+Koha 3.4.x or later no longer stores items in biblio records.
+If you are upgrading from an older version ou will need to do the
+following two steps, they can take a long time (several hours) to
+complete for large databases
+
+ misc/maintenance/remove_items_from_biblioitems.pl --run
+ misc/migration_tools/rebuild_zebra.pl -b -r
+