l10n_it_withholding_tax_causali/views/withholding_tax.xml
<?xml version="1.0" encoding="utf-8"?>
<openerp>
<data>
<record id="view_withholding_tax_form_causale" model="ir.ui.view">
<field name="name">view_withholding_tax_form_causale</field>
<field name="model">withholding.tax</field>
<field name="inherit_id" ref="l10n_it_withholding_tax.view_withholding_tax_form"/>
<field name="arch" type="xml">
<field name="payment_term" position="after">
<field name="causale_pagamento_id" attrs="{'invisible': [('wt_types', '!=', 'ritenuta')]}"/>
</field>
</field>
</record>
</data>
</openerp>