Hi, thanks Ewout and excuse me for answer most after.
I resolved this problem…follow me if it’s exact.
I install woocommerce-pdf-invoices-packing-slips and woocommerce-checkout-field-editor, next i go to the woocommerce-pdf-invoices-packing-slips–>templates—>pdf—>simple—>invoice.php
in the line 61 i paste this script:
<div class="recipient-address"><?php $wpo_wcpdf->billing_address(); ?></div>
P. Iva/C. Fisc. <?php
$yourfield = get_post_meta($wpo_wcpdf->export->order->id,'billing_vat',true);
if (isset($yourfield)) {
echo $yourfield;
}
?>
before in woocommerce-checkout-field-editor I insert the field Partita Iva and i setting the class ID billing_vat.
It works in my pdf invoice.
you agree with me?