Error al Generar Factura desde POS

ERROR xxx openerp.sql_db: Programming error: can't adapt type 'account.account', in query INSERT INTO "account_invoice_line" ("id",$
ERROR xxx openerp.http: Exception during JSON request handling.
Traceback (most recent call last):
  File "/home/openerp/apps/odoo/openerp/http.py", line 537, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/home/openerp/apps/odoo/openerp/http.py", line 574, in dispatch
    result = self._call_function(**self.params)
  File "/home/openerp/apps/odoo/openerp/http.py", line 310, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/service/model.py", line 113, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/http.py", line 307, in checked_call
    return self.endpoint(*a, **kw)
  File "/home/openerp/apps/odoo/openerp/http.py", line 803, in __call__
    return self.method(*args, **kw)
  File "/home/openerp/apps/odoo/openerp/http.py", line 403, in response_wrap
    response = f(*args, **kw)
  File "/home/openerp/apps/odoo/addons/web/controllers/main.py", line 948, in call_button
    action = self._call_kw(model, method, args, {})
  File "/home/openerp/apps/odoo/addons/web/controllers/main.py", line 936, in _call_kw
    return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/home/openerp/apps/odoo/addons/point_of_sale/point_of_sale.py", line 1027, in action_invoice
    inv_line_ref.create(cr, uid, inv_line, context=context)
 File "/home/openerp/apps/odoo/openerp/api.py", line 241, in wrapper
    return old_api(self, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/api.py", line 336, in old_api
    result = method(recs, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/models.py", line 4077, in create
    record = self.browse(self._create(old_vals))
  File "/home/openerp/apps/odoo/openerp/api.py", line 239, in wrapper
    return new_api(self, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/api.py", line 463, in new_api
    result = method(self._model, cr, uid, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/models.py", line 4215, in _create
    tuple([u[2] for u in updates if len(u) > 2])
  File "/home/openerp/apps/odoo/openerp/sql_db.py", line 158, in wrapper
    return f(self, *args, **kwargs)
  File "/home/openerp/apps/odoo/openerp/sql_db.py", line 234, in execute
    res = self._obj.execute(query, params)
ProgrammingError: can't adapt type 'account.account'