eiru_account_interest/views/account_invoice_interst.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
	<data>
		<record id="account_invoices_interest" model="ir.ui.view">
			<field name="name">account.invoices.interest</field>
			<field name="model">account.invoice</field>
			<field name="inherit_id" ref="account.invoice_form"/>
			<field name="arch" type="xml">
				<notebook>
					 <page string=" Interés por mora">
	 					<div class="eiru-verify-interest"></div>
						 <group col="1">
						   <field name="interest_ids" readonly="1" nolabel='1' delete='false' create='false'>
							   <tree delete='false' create='false' widget="many2onebutton">
								   <field name="name" string="Nombre"/>
								   <field name="date" string="Fecha"/>
								   <field name="reference" string="Nº Factura"/>
								   <field name="state" string="Estado"/>
							   </tree>
						   </field>
						 </group>
					 </page>
				</notebook>
			</field>
		</record>
	</data>
</openerp>