[Koha] Field 942$c and SQL

[Angel]

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Hello.

I have an installation on Debian 8, Koha 3.20, and Im' trying to
perform an import from GCStar. I had to update field 942$c (type of
Koha item) using SQL. I think is well done: if I select from
biblioitems, I can see the field itemtype set to 'BK' value, but if I
try to edit records using Koha interface, field 942$c is set to empty.

I was looking for itemtype field in schema but I'm only found in
biblioitems table with values.

Regards and thanks in advanced.
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