res_config_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="view_members_config_settings_form" model="ir.ui.view">
            <field name="name">members.config.settings.form</field>
            <field name="model">members.config.settings</field>
            <field name="arch" type="xml">
                <form class="oe_form_configuration">
                    <header>
                        <button string="Apply" type="object" name="execute" class="oe_highlight"/>
                        <button string="Cancel" type="object" name="cancel" class="oe_link"/>
                    </header>
                    <group string="Membership Configuration" name="config_member_section">
                    	<label for="max_number_settings" class="oe_inline" string="Maximum Associated People"/>
                    	<div name="max_number_settings">
							<field name="associated_people_available" widget="radio"/>
							<field name="max_nb_associated_people" nolabel="1" attrs="{'invisible':[('associated_people_available','=','unlimited')], 'required':[('associated_people_available', '=', 'limited')]}"/>
                    	</div>
                    </group>

                </form>
            </field>
        </record>
	</data>
</openerp>