def do_change_standard_price(self, cr, uid, ids, datas, context=None):
        """ Changes the Standard Price of Product and creates an account move accordingly.
        @param datas : dict. contain default datas like new_price, stock_output_account, stock_input_account, stock_journal
        @param context: A standard dictionary
        @return:

        """
        location_obj = self.pool.get('stock.location')
        move_obj = self.pool.get('account.move')
        move_line_obj = self.pool.get('account.move.line')
        if context is None:
            context = {}

        new_price = datas.get('new_price', 0.0)
        stock_output_acc = datas.get('stock_output_account', False)
        stock_input_acc = datas.get('stock_input_account', False)
        journal_id = datas.get('stock_journal', False)
        product_obj=self.browse(cr, uid, ids, context=context)[0]
        account_variation = product_obj.categ_id.property_stock_variation
        account_variation_id = account_variation and account_variation.id or False
        if not account_variation_id: raise osv.except_osv(_('Error!'), _('Variation Account is not specified for Product Category: %s') % (product_obj.categ_id.name))
        move_ids = []
        loc_ids = location_obj.search(cr, uid,[('usage','=','internal')])
        for rec_id in ids:
            for location in location_obj.browse(cr, uid, loc_ids, context=context):
                c = context.copy()
                c.update({
                    'location': location.id,
                    'compute_child': False
                })

                product = self.browse(cr, uid, rec_id, context=c)
                qty = product.qty_available
                diff = product.standard_price - new_price
                if not diff: raise osv.except_osv(_('Error!'), _("Could not find any difference between standard price and new price!"))
                if qty:
                    company_id = location.company_id and location.company_id.id or False
                    if not company_id: raise osv.except_osv(_('Error!'), _('Company is not specified in Location'))
                    #
                    # Accounting Entries
                    #
                    if not journal_id:
                        journal_id = product.categ_id.property_stock_journal and product.categ_id.property_stock_journal.id or False
                    if not journal_id:
                        raise osv.except_osv(_('Error!'),
                            _('There is no journal defined '\
                                'on the product category: "%s" (id: %d)') % \
                                (product.categ_id.name,
                                    product.categ_id.id,))
                    move_id = move_obj.create(cr, uid, {
                                'journal_id': journal_id,
                                'company_id': company_id
                                })

                    move_ids.append(move_id)


                    if diff > 0:
                        if not stock_input_acc:
                            stock_input_acc = product.product_tmpl_id.\
                                property_stock_account_input.id
                        if not stock_input_acc:
                            stock_input_acc = product.categ_id.\
                                    property_stock_account_input_categ.id
                        if not stock_input_acc:
                            raise osv.except_osv(_('Error!'),
                                    _('There is no stock input account defined ' \
                                            'for this product: "%s" (id: %d)') % \
                                            (product.name,
                                                product.id,))
                        amount_diff = qty * diff
                        move_line_obj.create(cr, uid, {
                                    'name': product.