GOLEM/golem_membership/report/golem_member_report.xml

<?xml version="1.0" encoding="utf-8"?>

<!--
Copyright 2017 Fabien Bourgeois <fabien@yaltik.com>
Copyright 2018 Michel Dessenne <michel@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>

      <template id="membership" inherit_id="golem_member.report_golem_member_template">
              <xpath expr="//div[@id='page_report_member']" position="after">
                <t t-call="report.external_layout">
                  <div class="page">
                    <table class="table table-striped">
                      <thead>
                        <strong>Membership</strong>
                        <tr>
                          <th>Season date</th>
                          <th>Registration</th>
                          <th>Registration type</th>
                          <th>State</th>
                        </tr>
                      </thead>
                      <tbody>
                        <t t-foreach="docs" t-as="o">
                          <tr>
                            <td class="col-xs-3">
                              <spam t-field="o.membership_start" />
                              <spam t-field="o.membership_stop" />
                            </td>
                            <td class="col-xs-3">
                              <spam t-field="o.member_lines.date" />
                            </td>
                            <td class="col-xs-3">
                              <spam t-field="o.member_lines.membership_id" />
                            </td>
                            <td class="col-xs-3">
                              <spam t-field="o.membership_state" />
                            </td>
                          </tr>
                        </t>
                      </tbody>
                    </table>
                  </div>
                </t>
              </xpath>

      </template>

</odoo>