Hello Zadeek,

It is quite simple. There is a rule in openerp that your each object should have one "name"  field. If not you should define any field as your name field in "_rec_name".

Syntax:

class mail_alias(osv.Model):
    _name = 'my.object'
    _rec_name = 'my_field'

_rec_name: Name of the field in which the name of every resource is stored. Default value: ‘name’. Note: by default, the name_get method simply returns the content of this field.

In short, you just have to either define "name" field or "_rec_name" in your object.

See _rec_name for more information.