pos/pos_picking_load/views/view_pos_config.xml

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

    <record  id="view_pos_config_form" model="ir.ui.view">
        <field name="model">pos.config</field>
        <field name="inherit_id" ref="point_of_sale.view_pos_config_form"/>
        <field name="arch" type="xml">
            <field name="iface_invoicing" position="after">
                <field name="iface_load_picking" />
                <field name="iface_load_picking_max_qty" attrs="{'invisible': [('iface_load_picking', '=', False)]}" />
            </field>
        </field>
    </record>

</data></openerp>