Good day everyone

We have this custom code to add a field to sales order object and shows error.  Any idea what could be wrong?    Version 15

source:

from odoo import models, fields, api,exceptions

class SaleOrder2Sap(models.Model):

    _inherit = 'sale.order'

    pedido = fields.Char(string="No Pedido") 

Error:

psycopg2.errors.UndefinedColumn: column sale_order.pedido does not exist

Thanks in advance