There is one field that since v6 and above was deleted and no longer used, ie one2one relations field. If we tried to make it in v6 the error will definitely occurs. OpenERP provides a solution 'combine' to the field many2one but here there is little difference. - See more at: http://findnerd.com/list/view/One2One-fields-in-Odoo-9/12291/#sthash.zlEN4JJT.dpuf
Topics
