odoo/addons/project_issue/res_config_view.xml

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

        <record id="view_project_config_issue" model="ir.ui.view">
            <field name="name">Project Application</field>
            <field name="model">project.config.settings</field>
            <field name="type">form</field>
            <field name="inherit_id" ref="base.project_settings_form_view"/>
            <field name="arch" type="xml">
                <group name="helpdesk" position="after">
                    <field name="fetchmail_issue"/>
                    <group colspan="2" attrs="{'invisible': [('fetchmail_issue','=',False)]}">
                        <field name="issue_server" attrs="{'required': [('fetchmail_issue','=',True)]}"/>
                        <field name="issue_type" on_change="onchange_fetchmail('issue', issue_type, issue_is_ssl)" attrs="{'required': [('fetchmail_issue','=',True)]}"/>
                        <field name="issue_port" attrs="{'required': [('fetchmail_issue','=',True)]}"/>
                        <field name="issue_is_ssl" on_change="onchange_fetchmail('issue', issue_type, issue_is_ssl)"/>
                        <field name="issue_user" attrs="{'required': [('fetchmail_issue','=',True)]}"/>
                        <field name="issue_password" password="True" attrs="{'required': [('fetchmail_issue','=',True)]}"/>
                    </group>
                </group>
            </field>
        </record>

    </data>
</openerp>