pos_ticket_gracia/static/src/xml/view.xml

<?xml version="1.0" encoding="UTF-8"?>
<templates id="template" xml:space="preserve">

    <!-- Mostrar Formulario -->
    <t t-extend="ClientDetails">
        <t t-jquery="div.client-details-left>div:first-child" t-operation="before">
            <div class='client-detail'>
                <span class='label'>RUC-DNI</span>
                <span class='detail client-ruc'><t t-esc='partner.ruc' /></span>
            </div>
        </t>
    </t>

    <!-- Editar Formulario -->
    <t t-extend="ClientDetailsEdit">
        <t t-jquery="div.client-details-left>div:first-child" t-operation="before">
            <div class='client-detail'>
                <span class='label'>RUC</span>
                <input class='detail client-ruc' name='ruc' t-att-value='partner.ruc' placeholder='RUC-DNI'></input>
            </div>
        </t>
    </t>
</templates>