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In the default DB, the field itemtypes is mapped to 300$f. If i read all 300 subfields, i see that it speaks of "item physical description", that's what biblioitems is supposed to speak of.

The 300$f tag contains information like "300 pages," "videodisc," etc -- literally, a physical description. itemtypes is a code devised by the library, e.g. "DVD" (not "videodisc"), so your mapping won't work with standard MARC21 cataloguing practice. I can probably write a script to populate biblioitems.itemtype from the values stored in marc_subfield_table. But unless something changes in the way Koha _imports_ MARC data, every library that tries to migrate to Koha will have the very same problem. Bug! Stephen