As discussed with seb, it should not be required to add portal_type here, because here.getPortalType() must work. Add some comment on the purpose of having some hardcoded items. 

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@20359 20353a03-c40f-0410-a6d1-a30d3c3de9de