server-tools/external_file_location/views/attachment_view.xml

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

        <record id="view_attachment_improved_form" model="ir.ui.view">
            <field name="model">ir.attachment.metadata</field>
            <field name="inherit_id" ref="attachment_base_synchronize.view_attachment_improved_form" />
            <field name="arch" type="xml">
                <field name="url" position="after">
                    <field name="task_id" attrs="{'required': [('file_type', '=', 'export_external_location')]}"/>
                    <field name="location_id"/>
                </field>
            </field>
        </record>

        <record id="view_external_attachment_tree" model="ir.ui.view">
            <field name="model">ir.attachment.metadata</field>
            <field name="inherit_id" ref="attachment_base_synchronize.view_external_attachment_tree" />
            <field name="arch" type="xml">
                <field name="file_type" position="after">
                    <field name="task_id"/>
                    <field name="location_id"/>
                </field>
            </field>
        </record>

    </data>
</openerp>