muk_base/muk_utils/actions/ir_attachment.xml

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

<!--     
	Copyright (C) 2017 MuK IT GmbH
	
    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>

<record id="action_attachment_migrate" model="ir.actions.server">
	<field name="name">Migrate</field>
	<field name="model_id" ref="base.model_ir_attachment" />
	<field name="binding_model_id" ref="base.model_ir_attachment" />
	<field name="state">code</field>
	<field name="code">records.action_migrate()</field>
</record>
		
</odoo>