[web2py] Reference doesn't work?

[Emceha]

Hi,

I have such model in db.py

db.define_table('dzialy',
      Field("nazwa", required=True),
      Field("opis", "text", required=True),
      Field("kolejnosc", "integer", required=True))

db.define_table('artykuly',
      Field('autor', db.auth_user, required=True),
      Field('dzial', 'reference dzialy', required=True),
      Field('tytul', 'string', required=True),
      Field('tresc', 'text', required=True))

In default appadmin forms I get reference do auth_user just fine (i
get combo box as expected where I select user). But the same doesn't
happen to dzial field. It looks like string field and allows me to
enter anything I want but later on I get errors while I try to check
all artykuly fields.

Is this a bug or am I doing something wrong?

Thanks