GOLEM/golem_activity_registration/views/golem_member_views.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright 2017 Fabien Bourgeois <fabien@yaltik.com>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->
<odoo>
  <data>

    <!-- Form -->
    <record id="golem_member_form_inherit_golem_activity_registration"
      model="ir.ui.view">
      <field name="name">Add activities registrations to member form</field>
      <field name="model">golem.member</field>
      <field name="inherit_id" ref="golem_member.golem_member_form" />
      <field name="arch" type="xml">
        <page name="membership" position="before">
          <page name="activities" string="Activities">
            <field name="id" invisible="1" />
            <group>
              <field name="activity_registration_ids"
                attrs="{'readonly': [('id', '=', False)]}"
                context="{'default_member_id': active_id, 'member_show': 0}" />
              <field name="activity_registration_all_ids" readonly="1"
                context="{'member_show': 0}" />
            </group>
          </page>
        </page>
      </field>
    </record>

    <!-- Searches -->
    <record id="golem_member_searches_inherit_golem_activity_registration"
      model="ir.ui.view">
      <field name="name">Add activities registrations to member searches</field>
      <field name="model">golem.member</field>
      <field name="inherit_id" ref="golem_member.golem_member_search" />
      <field name="arch" type="xml">
          <field name="number" position="before">
            <field name="activity_registration_all_ids" widget="many2one"/>
          </field>
      </field>
    </record>
  </data>
</odoo>