pos/pos_journal_image/demo/account_journal.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Copyright (C) 2019 - Today: GRAP (http://www.grap.coop)
@author: Sylvain LE GAL (https://twitter.com/legalsylvain)
License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
-->
<openerp><data>

    <record id="account.cash_journal" model="account.journal">
        <field name="pos_image" type="base64" file="pos_journal_image/static/img/cash_journal-pos_image.png"/>
    </record>

    <record id="account.check_journal" model="account.journal">
        <field name="pos_image" type="base64" file="pos_journal_image/static/img/check_journal-pos_image.png"/>
    </record>

</data></openerp>