spree_core_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
	<data>
		<record model="ir.ui.view" id="spree_instances_form">
			<field name="name">External Referentials</field>
			<field name="model">external.referential</field>
			<field name="inherit_id" ref="base_external_referentials.external_referential_form_view" />
			<field name="type">form</field>
			<field name="arch" type="xml">
			    <xpath expr="/form/group[2]/notebook" position="replace">
					<notebook colspan="4">
						<page string="Referential Actions">
				        	<separator string="Compulsory" colspan="4" />
				            <button name="refresh_mapping" string="1 - Reload Referential Mapping Templates" colspan="2" type="object" />
            				<button name="core_sync" string="2 - Synchronize Referential Settings" colspan="2" type="object" attrs="{'readonly':[('mapping_ids','=',[])]}"/>
            				<separator string="Optional - Initial import only" colspan="4" />	
							<button name="sync_categs" string="1 - Import Product Categories" colspan="2" type="object" />
						</page>
						<page string="Websites">
							<field name="shop_group_ids" nolabel="1" />
						</page>						
					</notebook>
				</xpath>
			</field>
		</record>
	</data>
</openerp>