l10n_it_account_stamp/views/invoice_view.xml
<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>
<!-- Form: Invoice Customer -->
<record id="invoice_form_stamp" model="ir.ui.view">
<field name="name">account.invoice.form.stamp</field>
<field name="model">account.invoice</field>
<field name="inherit_id" ref="account.invoice_form"/>
<field name="arch" type="xml">
<xpath expr="//field[@name='invoice_line']/tree/field[@name='sequence']" position="after">
<field name="is_stamp_line" invisible="1"/>
</xpath>
<xpath expr="//field[@name='invoice_line']/tree" position="attributes">
<attribute name="colors">CadetBlue:is_stamp_line==True;</attribute>
</xpath>
<field name="date_due" position="after">
<field name="tax_stamp"/>
</field>
<field name="invoice_line" position="after">
<button type="object" string="Add tax stamp line"
states="draft"
name="add_tax_stamp_line" attrs="{'invisible': [('tax_stamp', '=', False)]}"/>
</field>
</field>
</record>
<record id="view_invoice_line_form_stamp" model="ir.ui.view">
<field name="name">view_invoice_line_form_stamp</field>
<field name="model">account.invoice.line</field>
<field name="inherit_id" ref="account.view_invoice_line_form"/>
<field name="arch" type="xml">
<field name="product_id" position="after">
<field name="is_stamp_line" invisible="1"/>
</field>
</field>
</record>
</data>
</openerp>