eiru_account_bank_statement_utility/models/account_bank_statement.py

# -*- coding: utf-8 -*-
from openerp import models, fields, tools, api

class AccountBankStatement(models.Model):
    _inherit = 'account.bank.statement'

    @api.model
    def _default_type_statement(self):
        typeStatement =  self.env['account.bank.statement.type'].search([('is_default', '=', True)],limit=1)
        return typeStatement.id if (typeStatement) else ''

    type_statement = fields.Many2one('account.bank.statement.type', string='Tipo de Caja', ondelete='restrict')

    _defaults = {
        'type_statement': _default_type_statement,
    }

    @api.model
    def update_statement_type_defualt(self):
        type =  self.env['account.bank.statement.type'].search([('is_default', '=', True)],limit=1)
        statement = self.env['account.bank.statement'].search([('type_statement', '=', False)])
        if (not statement):
            return False

        for statementUpdate in statement:
            statementUpdate.write({
                'type_statement': type.id
            })