Odoo TypeError: смешивание яблок и апельсинов в унаследованной модели

У меня есть odoo 12 с модулем «Управление контрактами — повторяющиеся», и я пишу модуль, который создает модель под названием «аренда», которая наследуется от account.analytic.account с использованием _inherit. Представление формы наследуется от contract.account_analytic_account_sale_form. Это работает очень хорошо, за исключением того, что когда я пытаюсь добавить продукты из строк счета-фактуры, я получаю сообщение об ошибке

TypeError: Mixing apples and oranges: account.analytic.account(<odoo.models.NewId object at 0x07736650>,) & pmtest.leases(<odoo.models.NewId object at 0x07736650>,)

Модель:

class leases(models.Model):
    _name = 'pmtest.leases'
    _description = 'Leases - inherit from Contracts'
    _inherit = 'account.analytic.account'
    lease

имя = поля.Char()

Вид

<record id = "pmtest_leases_form" model = "ir.ui.view">
    <field name = "name">pmtest.leases.form</field>
    <field name = "model">pmtest.leases</field>
    <field name = "inherit_id" ref = "contract.account_analytic_account_sale_form"/>
    <field name = "mode">primary</field>
    <field name = "priority" eval = "20"/>
    <field name = "arch" type = "xml">
        <xpath expr = "//field[@name='partner_id']" position = "after">
                <field name = "leasename" string = "Lease Name"/>
        </xpath>
    </field>
</record>

полная трассировка стека:

Odoo Server Error
Traceback (most recent call last):
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 654, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 312, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\tools\pycompat.py", line 87, in reraise
    raise value
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 696, in dispatch
    result = self._call_function(**self.params)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 344, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\service\model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 337, in checked_call
    result = self.endpoint(*a, **kw)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 939, in __call__
    return self.method(*args, **kw)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\http.py", line 517, in response_wrap
    response = f(*args, **kw)
  File "c:\program files (x86)\odoo 12.0\server\odoo\addons\web\controllers\main.py", line 962, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "c:\program files (x86)\odoo 12.0\server\odoo\addons\web\controllers\main.py", line 954, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 749, in call_kw
    return _call_kw_multi(method, model, args, kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\api.py", line 736, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 5455, in onchange
    record[name] = value
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 5097, in __setitem__
    return self._fields[key].__set__(self, value)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\fields.py", line 1002, in __set__
    spec = self.modified_draft(record)
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\fields.py", line 1147, in modified_draft
    lambda rec: rec if path == 'id' else rec._mapped_cache(path) & records
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 4866, in filtered
    return self.browse([rec.id for rec in self if func(rec)])
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 4866, in <listcomp>
    return self.browse([rec.id for rec in self if func(rec)])
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\fields.py", line 1147, in <lambda>
    lambda rec: rec if path == 'id' else rec._mapped_cache(path) & records
  File "C:\Program Files (x86)\Odoo 12.0\server\odoo\models.py", line 5002, in __and__
    raise TypeError("Mixing apples and oranges: %s & %s" % (self, other))
TypeError: Mixing apples and oranges: account.analytic.account(<odoo.models.NewId object at 0x04F49BB0>,) & pmtest.leases(<odoo.models.NewId object at 0x04F49BB0>,)