If you want to move an override of the ir.actions.report_xml.create() method. Then you have to follow the following code in your .py file.

# -*- coding: utf-8 -*-

import time
import math

from openerp.osv import expression
from openerp.tools.float_utils import float_round as round
from openerp.tools import DEFAULT_SERVER_DATETIME_FORMAT
from openerp.exceptions import UserError, ValidationError
from openerp import api, fields, models, _


class AccountAccountType(models.Model):
    _name = "account.account.type"
    _description = "Account Type"

    name = fields.Char(string='Account Type', required=True, translate=True)
    include_initial_balance = fields.Boolean(string="Bring Accounts Balance Forward", help="Used in reports to know if we should consider journal items from the beginning of time instead of from the fiscal year only. Account types that should be reset to zero at each new fiscal year (like expenses, revenue..) should not have this option set.")
    type = fields.Selection([
        ('other', 'Regular'),
        ('receivable', 'Receivable'),
        ('payable', 'Payable'),
        ('liquidity', 'Liquidity'),
    ], required=True, default='other',
        help="The 'Internal Type' is used for features available on "\
        "different types of accounts: liquidity type is for cash or bank accounts"\
        ", payable/receivable is for vendor/customer accounts.")
    note = fields.Text(string='Description')


class AccountAccountTag(models.Model):
    _name = 'account.account.tag'
    _description = 'Account Tag'

    name = fields.Char(required=True)
    applicability = fields.Selection([('accounts', 'Accounts'), ('taxes', 'Taxes')], required=True, default='accounts')
    color = fields.Integer('Color Index')