add implied_ids in group

Hello everyone, I have a problem when I try to add a implied_id in the implied_ids atribute of res.groups. I tried this code: implied_id = obj.search([('name', '=', 'Mostrar las iniciativas propias')]) (if I print this variable I get this result: [7] group_id = oerp.create('res.groups', {'name': name_group, 'category_id': category_id[0], 'implied_ids': implied_id}) The group is created correctly with his name and category, but implied_ids is empty... I don't know why... I use the oerplib. Somebody knows what I'm doing wrong? Thank you in advance