Hi!

The recordData object in javascript has all the fields data. In account.invoice this is object:

For the Many2one fields this is the data:

The "data" only has "display_name" and "id", but i need "vat" field.

Is there a way to get more fields? 

My first option is a rpc to get the partner data using the id (this.recordData.partner_id.data.id), i tried and it works.

var def = this._rpc({
    model: 'res.partner',
    method: 'search_read',
    domain: [
        ['id', '=', this.recordData.partner_id.data.id]
    ],
}).then(function (result) {
    partner_data = result[0];
});

My second option is a related field, also works.

partner_vat = fields.Char(related='partner_id.vat')

But i want to know if i can avoid this rpc call and avoid create a new related field.

Thanks.