I am a new to python and openerp. the following code loads into openerp with no errors; however, I am not seeing any data from res.partner as I am expecting to.

Can anyone see what the problem is in my code?

 class delivery_forcast(osv.osv):

    _name = "delivery.forcast"
    _inherit = "res.partner"
    _columns={
        'delivery_state': fields.selection([
            ('scheduled','Scheduled'),
            ('delivered','Delivered')],
                'Delivery Status', readonly=True, track_visibility='onchange'),
        'est_delivery_date': fields.date('Estimated Delivery Date', readonly=False),
        'container_size': fields.integer('Container Size', help='Container size to be filled in gallons',readonly=False),
    }

delivery_forcast()

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="view_delivery_forcast_tree" model="ir.ui.view">
            <field name="name">delivery.forcast.tree</field>
            <field name="model">delivery.forcast</field>
            <field name="arch" type="xml">
                <tree string="Partner List">
                    <field name="name"/>
                    <field name="est_delivery_date"/>  
                    <field name="container_size"/>   
                    <field name="delivery_state"/> 
                </tree>
            </field>
        </record>


        <record id="show_delivery_forcast_tree" model="ir.actions.act_window">
            <field name="name">Delivery Forcasts</field>
            <field name="res_model">delivery.forcast</field>
            <field name="view_type">tree</field>
            <field name="view_mode">tree</field>
            <field name ="domain">[('customer','=',1)]</field>  
        </record>


        <menuitem name="Delivery Forcasts" id="menu_delivery_forcasts" action="show_delivery_forcast_tree"/>

    </data>

</openerp>