Hi, 

I've created a new class like this: 

class vi_unavailability(models.Model):
    _name = 'vi.unavailability'
    _order = 'date_unavailable'
    _rec_name = 'date_unavailable'
    _description = u"Unavailability"
    date_unavailable = fields.Date(string='Date Unavailable',required=True)
    vi_product_id = fields.Many2one(comodel_name='product.template', string='Product')

But in log file I'm always getting this warning: 

vi.unavailability.read() with unknown field 'name'

Is this normal?

I'm new in v9 ... 
Thanks