# -*- coding: utf-8 -*-
import ast
import base64
import csv
import glob
import itertools
import logging
import operator
import datetime
import hashlib
import os
import re
import simplejson
import time
import urllib
import urllib2
import urlparse
import xmlrpclib
import zlib
from xml.etree import ElementTree
from cStringIO import StringIO
import babel.messages.pofile
import werkzeug.utils
import werkzeug.wrappers
try:
    import xlwt
except ImportError:
    xlwt = None
import openerp
import openerp.modules.registry
from openerp.tools.translate import _
from openerp.tools import config
from openerp.addons.web import http
openerpweb = http
from openerp.addons.web.controllers.main import Reports
def content_disposition(filename, req):
    filename = filename.encode('utf8')
    escaped = urllib2.quote(filename)
    browser = req.httprequest.user_agent.browser
    version = int((req.httprequest.user_agent.version or '0').split('.')[0])
    if browser == 'msie' and version < 9:
        return "attachment; filename=%s" % escaped
    elif browser == 'safari':
        return "attachment; filename=%s" % filename
    else:
        return "attachment; filename*=UTF-8''%s" % escaped
 
class change_main(Reports):
    @openerpweb.httprequest
    def index1(self, req, action, token):
        
        action = simplejson.loads(action)
        report_srv = req.session.proxy("report")
        context = dict(req.context)
        
        context.update(action["context"])
        report_data = {}
        report_ids = context["active_ids"]
        if 'report_type' in action:
            report_data['report_type'] = action['report_type']
        if 'datas' in action:
            if 'ids' in action['datas']:
                report_ids = action['datas'].pop('ids')
            report_data.update(action['datas'])
        report_id = report_srv.report(
            req.session._db, req.session._uid, req.session._password,
            action["report_name"], report_ids,
            report_data, context)
        report_struct = None
        while True:
            report_struct = report_srv.report_get(
                req.session._db, req.session._uid, req.session._password, report_id)
            if report_struct["state"]:
                break
            time.sleep(self.POLLING_DELAY)
        report = base64.b64decode(report_struct['result'])
        if report_struct.get('code') == 'zlib':
            report = zlib.decompress(report)
        report_mimetype = self.TYPES_MAPPING.get(
            report_struct['format'], 'octet-stream')
        file_name = action.get('name', 'report')
        if 'name' not in action:
            reports = req.session.model('ir.actions.report.xml')
            res_id = reports.search([('report_name', '=', action['report_name']),],
                                    0, False, False, context)
            if len(res_id) > 0:
                file_name = reports.read(res_id[0], ['name'], context)['name']
            else:
                file_name = action['report_name']
        file_name = '%s.%s' % (file_name, report_struct['format'])
        
        ########################################################
        # PATCH TO PRINT PARTNER-ID AND INVOICE NO IN FILE NAME
        if context['active_model'] in ['sale.order','purchase.order','account.invoice']:
            model1 =req.session.model(context['active_model'])
            read=model1.read(context['active_id'],[],context)
            if read['name']!=False:
                file_name = read['name'] + ' ' + read['partner_id'][1]
                print file_name
                file_name = '%s.%s' % (file_name, report_struct['format'])
            # PATCH END
        #########################################################
        
        return req.make_response(report,
             headers=[
                 ('Content-Disposition', content_disposition(file_name, req)),
                 ('Content-Type', report_mimetype),
                 ('Content-Length', len(report))],
             cookies={'fileToken': token})
        
        
    Reports.index=index1
What did you enter in the "Save as Attachment Prefix" field while editing the report?
('MyReport '+(object.inv_num and (object.type)).replace('/','')+'.pdf')
where inv_num & type are the fields present in that module.