Hi Akhil, thanks so much for your reply. The problem is that I have a function called 'search_calls_by_customer' which calls API and saves data in array called 'clientDataAndBillIdArray'. I need that this array starts at 0 each time I call the API. So if I do a method called '_get_data' I can't access to this data array. Odoo had any method to create a new tree view line for each array object? I need create the tree line in the same function that calls API. Here me py code: client_name= fields.Char('Nombre cliente', readonly=True) client_cif= fields.Char('CIF cliente', readonly=True) bill_id= fields.Char('ID de factura', readonly=True) . . . for key2 in jData2: for key in billIdClientIdArray: if(key2[u'id']==key[u'client']): clientDataAndBillIdArray.append("{"+key2[u'id']+","+key2[u'cif']+","+key2[u'name']+","+key[u'id']+"}") self.client_name=key2[u'name'] I tried this, but only show the last name client of the array. Thank so much in advance! :)