Custom script - fetch data

Hello @sofia, add_fetch is joking with you, because it dont work for grid rows :smile:

you can use

frappe.ui.form.on('Quotation Item', 'item_code', function(frm, cdt, cdn){
    frappe.call({
        'method': 'frappe.client.get_value',
        'args': {
            'doctype': 'Item',
            'filters': [
                ['Item', 'item_code', '=', locals[cdt][cdn].item_code]
            ],
           'fieldname':'nombre_de_venta'
        },
        'callback': function(res){
            frappe.mode.set_value(cdt, cdn, 'nombre_de_venta', res.message.nombre_de_venta);
        }
    });
});
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