How to change default form of many2one field in odoo - odoo

Question

Hi I have a mode Unit which inherits product.product.
I have defined the custom views for Unit and they work fine from the menu.
Property which inherits account.asset.assets has multiple units.
How do I call my custom unit views from the Property view?
When I click on Add an item I get the standard product form.
<record id="unit_form" model="ir.ui.view">
<field name="name">All Units</field>
<field name="model">product.product</field>
<field name="sequence">0</field>
<field name="arch" type="xml">
<form string="Unit">
<group>
<field name="property_id" widget="many2one" attrs="{'required': [('is_unit', '=', True)]}" />
<field name="is_unit" invisible="1" />
<field name="features_amenities_ids" placeholder="Features and Amenities" widget="many2many_tags" />
<field name="appliences_ids" placeholder="Apliences" widget="many2many_tags" />
<field name="lst_price" string="Rent" />
</group>
</form>
</field>
</record>
<record id="unit_tree" model="ir.ui.view">
<field name="name">All Units</field>
<field name="model">product.product</field>
<field name="arch" type="xml">
<tree string="Units" default_order='property_id,name'>
<field name="property_id" />
<field name="name" string="Unit#" />
</tree>
</field>
</record>
<record id="action_unit" model="ir.actions.act_window">
<field name="name">Units</field>
<field name="res_model">product.product</field>
<field name="view_mode">search, kanban,tree,form</field>
<field name="domain">[('is_unit', '=', True)]</field>
<field name="context">{'default_is_unit':1 }</field>
<field name="search_view_id" ref="unit_search"/>
<field name="help" type="html">
<p class="oe_view_nocontent_create">
Click to create a Unit.
</p>
<p>
Here you will find the all units.
</p>
</field>
</record>
<record id="action_unit_form" model="ir.actions.act_window.view">
<field name="act_window_id" ref="action_unit" />
<field name="view_id" ref="unit_form" />
<field name="view_mode">form</field>
<field name="sequence">10</field>
</record>
<record id="action_unit_tree" model="ir.actions.act_window.view">
<field name="act_window_id" ref="action_unit" />
<field name="view_id" ref="unit_tree" />
<field name="view_mode">tree</field>
<field name="sequence">9</field>
</record>
<record id="action_unit_kanban" model="ir.actions.act_window.view">
<field name="act_window_id" ref="action_unit" />
<field name="view_id" ref="product.product_kanban_view" />
<field name="view_mode">kanban</field>
<field name="sequence">8</field>
</record>
<menuitem action="action_unit" sequence="2"
id="menu_units_list" name="Units" parent="menu_property_sub"/>
This is from Property
<notebook colspan="4">
<page string="Units">
<field name="unit_ids" nolabel="1" widget="one2many" >
<tree string="Units">
<field name="name" string="Unit#"/>
</tree>
</field>
</page>
</notebook>

Answer 1

If you want to specify a view for many2one or one2many field:
<field name="m2o_id" context="{'form_view_ref': 'module_name.form_id'}"/>
hope this helps. there are other key word like tree_view_ref for tree views