account-financial-tools/account_move_name_sequence/views/account_journal.xml

<?xml version="1.0" encoding="utf-8" ?>
<!--
  Copyright 2021 Akretion France (http://www.akretion.com/)
  @author: Alexis de Lattre <alexis.delattre@akretion.com>
  License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
-->
<odoo>

    <record id="view_account_journal_form" model="ir.ui.view">
        <field name="model">account.journal</field>
        <field name="inherit_id" ref="account.view_account_journal_form" />
        <field name="arch" type="xml">
            <field name="refund_sequence" position="before">
                <field
                    name="sequence_id"
                    required="0"
                    context="{'default_name': name, 'default_company_id': company_id, 'default_implementation': 'no_gap', 'default_padding': 4, 'default_use_date_range': True, 'default_prefix': (code or 'UNKNOWN') + '/%%(range_year)s/'}"
                />
            </field>
            <field name="refund_sequence" position="after">
                <field
                    name="refund_sequence_id"
                    attrs="{'invisible': ['|', ('type', 'not in', ('sale', 'purchase')), ('refund_sequence', '=', False)]}"
                    required="1"
                    context="{'default_name': name, 'default_company_id': company_id, 'default_implementation': 'no_gap', 'default_padding': 4, 'default_use_date_range': True, 'default_prefix': 'R' + (code or 'UNKNOWN') + '/%%(range_year)s/'}"
                />
            </field>
        </field>
    </record>

</odoo>