eiru_payment_term_generator/views/account_payment_term.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
	<data>
        
        <!-- Form view -->
        
        <record model="ir.ui.view" id="account_payment_term_form_view">
            <field name="name">account.payment.term.form.view</field>
            <field name="model">account.payment.term</field>
            <field name="inherit_id" ref="account.view_payment_term_form"/>
            <field name="arch" type="xml">
                <field name="line_ids" position="before">
                    <group>
                        <group>
                            <field name="invoice_amount" string="Valor de la factura"/>
                            <field name="amount" string="Valor de la cuota"/>
                            <field name="frequency" string="Periodo de pago"/>  
                        </group>
                        <group>
                            <div class="calculate_term_box"></div>
                            <button name="clean_lines" class="oe_button oe_form_button oe_highlight" string="Limpiar" type="object"/>
                        </group>
                        <group></group>
                    </group>
                </field>
            </field>
        </record>
	</data>
</openerp>