<tree string='List' editable='bottom'>
<field name='product_id' on_change='onchange_price(product_id)'/>
<field name='note' />
<tree string='List' editable='bottom'>
<field name='product_id' on_change='onchange_price(product_id)'/>
<field name='note' />
+ <field name='price' on_change='onchange_price(product_id)'/>
<field name='supplier' invisible="1"/>
<field name="state" invisible="1"/>
</tree>
<field name='supplier' invisible="1"/>
<field name="state" invisible="1"/>
</tree>