pos_logo/pos_view.xml

<?xml version="1.0"?>
<openerp>
    <data>
        
        <record model="ir.ui.view" id="view_pos_config_form_inh_poslogo">
            <field name="name">pos.config.form.view.inh.poslogo</field>
            <field name="model">pos.config</field>
	    <field name="inherit_id" ref="point_of_sale.view_pos_config_form"/>
            <field name="arch" type="xml">
                <label for="name" position="before">
                    <group>
			<field name="image_medium" widget='image' class="oe_left oe_avatar" nolabel="1"/>
		    </group>
                </label>
                <field name="iface_big_scrollbars" position="after">
		    <field name="time_format" required="1"/>
                </field>
	    </field>
	</record>
	
	<template id="pos_logo_extend" name="pos_logo" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/pos_logo/static/src/js/pos_logo.js"></script>               
            </xpath>
        </template>

    </data>
</openerp>