import time

from openerp.osv import fields, osv

class bac_stock_move(osv.osv):
    _inherit = 'stock.move'
    _name = 'bac.stock.move'
    _description = 'bac_stock_move'

    _columns = {
        'supplier': fields.boolean('Supplier'),
        'customer': fields.boolean('Customer'),
        'supplier_id' : fields.many2one('res.partner', 'Supplier', domain=[('supplier','=','1')]),
        'customer_id' : fields.many2one('res.partner', 'Customer', domain=[('customer','=','1')]),
    }
bac_stock_move()

And your xml file should be <openerp> <data>

    <record id="bac_stock_move_form" model="ir.ui.view">
    <field name="name">bac.stock.move.form</field>
    <field name="model">stock.move</field>
    <field name="inherit_id" ref="stock.view_move_form"/>
    <field name="arch" type="xml">

      <xpath expr="//group[@name='main_grp']/field[@name='name']" position="after">

        <field name="supplier" invisible="1"/>
        <field name="customer" invisible="1"/>
        <field name="supplier_id" attrs="{ 'invisible':[('supplier', '!=', True)]}"/>
        <field name="customer_id" attrs="{ 'invisible':[('customer', '!=', True)]}"/>
      </xpath>

    </field>
    </record>
    <record id="action_bac_stock_supplier" model="ir.actions.act_window">
        <field name="name">Incoming Products</field>
        <field name="res_model">bac.stock.move</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        <field name="domain">[('supplier', '=', True)]</field>
        <field name="context">{ 'default_supplier':True}</field>

    </record>
    <record id="action_bac_stock_customer" model="ir.actions.act_window">
        <field name="name">Outgoing Products</field>
        <field name="res_model">bac.stock.move</field>
        <field name="view_type">form</field>
        <field name="view_mode">tree,form</field>
        <field name="domain">[('customer', '=', True)]</field>
        <field name="context">{ 'default_customer':True}</field>

    </record>


    </data>
</openerp>

and please add the respective Menu items for the above actions to make it display on your client.