Hi all! I'm struggling with a really strange issue: I have this simple module that adds two fields to Fleet:

from odoo import models, fields, api
class FleetVehicleExtension(models.Model):
    _name = 'fleet.vehicle.extension2'
    _description = 'Taller'
    _inherit = 'fleet.vehicle'
    x_location = fields.Selection(
        string='Ubicación',
        help='Área de la empresa a la que el vehículo está asignado.',
        required=True,
        default=None,
        selection=[
            ('mll', 'Muellaje'),
            ('adm', 'Administración'),
            ('ap', 'Agua potable'),
        ]
    )
    x_type = fields.Selection(
        string='Tipo',
        help='Seleccionar generador o tipo de vehículo.',
        required=True,
        default=None,
        selection=[
            ('c', 'Camioneta'),
            ('cp', 'Camión pluma'),
            ('cc', 'Camión capacho'),
        ]
    )

But, when i try to install it, Odoo claims that I have a non-well formed M2M field, but no M2M field is present in my module at all! Any ideas?

Odoo Server Error

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_http.py", line 237, in _dispatch
    result = request.dispatch()
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 683, in dispatch
    result = self._call_function(**self.params)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 359, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/service/model.py", line 94, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 347, in checked_call
    result = self.endpoint(*a, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 912, in __call__
    return self.method(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 531, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1381, in call_button
    action = self._call_kw(model, method, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/addons/web/controllers/main.py", line 1369, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 396, in call_kw
    result = _call_kw_multi(method, model, args, kwargs)
  File "/usr/lib/python3/dist-packages/odoo/api.py", line 383, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "<decorator-gen-71>", line 2, in button_immediate_install
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 73, in check_and_log
    return method(self, *args, **kwargs)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 474, in button_immediate_install
    return self._button_immediate_function(type(self).button_install)
  File "/usr/lib/python3/dist-packages/odoo/addons/base/models/ir_module.py", line 592, in _button_immediate_function
    modules.registry.Registry.new(self._cr.dbname, update_module=True)
  File "/usr/lib/python3/dist-packages/odoo/modules/registry.py", line 89, in new
    odoo.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 453, in load_modules
    processed_modules += load_marked_modules(cr, graph,
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 346, in load_marked_modules
    loaded, processed = load_module_graph(
  File "/usr/lib/python3/dist-packages/odoo/modules/loading.py", line 197, in load_module_graph
    registry.setup_models(cr)
  File "/usr/lib/python3/dist-packages/odoo/modules/registry.py", line 276, in setup_models
    model._setup_fields()
  File "/usr/lib/python3/dist-packages/odoo/models.py", line 2839, in _setup_fields
    field.setup_full(self)
  File "/usr/lib/python3/dist-packages/odoo/fields.py", line 399, in setup_full
    self._setup_regular_full(model)
  File "/usr/lib/python3/dist-packages/odoo/fields.py", line 3461, in _setup_regular_full
    raise TypeError(msg % (self, field))
Exception
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 639, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/lib/python3/dist-packages/odoo/http.py", line 315, in _handle_exception
    raise exception.with_traceback(None) from new_cause
TypeError: Many2many fields fleet.vehicle.extension2.tag_ids and fleet.vehicle.tag_ids use the same table and columns