I allready made a modul to create field base_price at sales order line, now I want to fill that field with list_price from product template and change everytime product_id change, how to write a modul for that purpose.

I wrote this modul for trial , but didn't work.

this is modul to create field base_price

from openerp.osv import orm, fields

import openerp.addons.decimal_precision as dp

class sale_order_line(orm.Model):

_name = 'sale.order.line'

_inherit = 'sale.order.line'

_columns = {

'base_price':fields.float('Base Price', required=True, digits_compute=dp.get_precision('Product Price'), readonly=True, states={'draft':[('readonly', False)]}),

}

_default = {

'base_price': 0.0,

}

this is the xml file

<?xml version="1.0"?>
<openerp>
<data>
<record model="ir.ui.view" id="view_order_form">
<field name="name">sale.order.form</field>
<field name="model">sale.order</field>
<field name="inherit_id" ref="sale.view_order_form"/>
<field name="type">form</field>
<field name="arch" type="xml">
<xpath expr="//form/sheet/notebook/page/field[@name='order_line']/form/group/group/field[@name='price_unit' ]" position="before">
<field name="base_price"/>
</xpath>
<xpath expr="//form/sheet/notebook/page/field[@name='order_line']/tree/field[@name='price_unit' ]" position="before">
<field name="base_price"/>
</xpath>
</field>
</record>
</data>
</openerp>

And this is a modul to fiiling value to that fields, and I make it at different modul.

from openerp.osv import orm, fields, api

class sale_order_line(orm.Model):

    _inherit = "sale.order.line"

    def product_id_change( self, cr, uid, ids, pricelist, product, qty=0, uom=False, qty_uos=0, uos=False, name='',

        partner_id=False, lang=False, update_tax=True, date_order=False, packaging=False,

        fiscal_position=False, flag=False, context=None):

        vals=super(sale_order_line.self).product_id_change(cr, uid, ids, pricelist, product, qty=qty, uom=uom,

        qty_uos=qty_uos, uos=uos, name=name, partner_id=partner_id, lang=lang, update_tax=update_tax,         date_order=date_order, packaging=packaging, fiscal_position=fiscal_position, flag=flag, context=context)

        vals['value'].update({'base_price':999.99})

        return vals

There are no error when I'm installing this modul, but when I change Product at sales order line form, nothing happened to field base_price.

Sorry there are no equal before 999.99, it's mistype.