view.xml

<?xml version="1.0"?>
<odoo>

  <record id="view_form_demo_delegation_tutorial" model="ir.ui.view">
    <field name="name">Demo Delegation Tutorial Form</field>
    <field name="model">demo.delegation</field>
    <field name="arch" type="xml">
      <form string="Demo Delegation Tutorial">
        <sheet>
          <group>
            <!-- res.partner -->
            <field name="name"/>
            <field name="company_id"/>
            <!-- res.partner -->

            <!-- demo.delegation -->
            <field name="partner_id" invisible="1" attrs="{'required': [('id', '!=', False)]}"/>
            <field name="first_name"/>
            <!-- demo.delegation -->
          </group>
        </sheet>
      </form>
    </field>
  </record>

  <record id="view_tree_demo_delegation_tutorial" model="ir.ui.view">
    <field name="name">Demo Delegation Tutorial List</field>
    <field name="model">demo.delegation</field>
    <field name="arch" type="xml">
      <tree>
        <!-- res.partner -->
        <field name="partner_id" invisible="1" attrs="{'required': [('id', '!=', False)]}"/>
        <field name="name"/>
        <field name="company_id"/>
        <!-- res.partner -->

        <!-- demo.delegation -->
        <field name="first_name"/>
        <!-- demo.delegation -->
      </tree>
    </field>
  </record>

</odoo>