Hello,

I have a problem in inheriting a custom model created from Odoo interface, where I cannot append a new field from a custom module (addons-custom/mycustom)

Here is step by step :

1- create a model from settings-> model:   x_check_y

2- develop a custom module in order to add a field to the model:

class CheckY(models.Model):
    _inherit = 'x_check_y'   
    temp = fields.Char("temp")

3- restart Odoo:  Model x_check_y  does not exist in registry

  raise TypeError("Model %r does not exist in registry." % name)
TypeError: Model 'x_check_y' does not exist in registry.

Note that the inheritance is working on OpenAcademy module where I have added a new field on courses from this custom module.

Odoo 10 Enterprise / Ubuntu