GOLEM/golem_activity_registration_state/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 model="ir.ui.view" id="golem_member_form_inherit_registration_state">
      <field name="name">Add state for registrations</field>
      <field name="model">golem.member</field>
      <field name="inherit_id"
        ref="golem_activity_registration.golem_member_form_inherit_golem_activity_registration" />
      <field name="arch" type="xml">
        <p name="default_season_label" position="after">
            <p attrs="{'invisible': [('id', '!=', False)]}" style="color:red;}">
                Note that you can't register activities if the member is new and not yet saved into the database.
            </p>
            <p>
              <field name="has_draft_registrations" invisible="1" />
              <button name="do_validate_registrations" type="object"
                string="Validate all draft registrations"
                class="oe_highlight"
                help="If you validate draft registration, they will be seen as confirmed. Then, an invoice will be created for the current member."
                attrs="{'invisible': [('has_draft_registrations', '=', False)]}" />
            </p>
        </p>
        <!-- TODO : one by one cancelation -->
        <!-- TODO : do not allow removal if confirmed -->
        <tree position="attributes">
          <attribute name="colors">red: state == 'canceled';darkgrey: state == 'draft';</attribute>
        </tree>
        <tree position="inside">
          <field name="state" invisible="1" />
        </tree>
        <field name="member_id" position="after">
          <field name="invoice_id" readonly="1" />
        </field>
      </field>
    </record>

  </data>
</odoo>