I'm creating a custom module in odoo and I'm struggling with an inheritance issue, let's say i have the following implementation :

class SuperModel(models.Model) :
   _name="model_name"
   _inherits={'model_name.one':'model_name_one_id',
              'model_name.two':'model_name_two_id'}
   selection = fields.Selection(selection=[('m1','Model one'),('m2','Model Two')])
   model_name_one_id = fields.Many2one(comodel_name="model_name.one",ondelete="cascade")
   model_name_two_id = fields.Many2one(comodel_name="model_name.two",ondelete="cascade")

class ModelOne(models.Model):
   _name="model_name.one"
   value_one = fields.Char()

class ModelTwo(models.Model):
   _name="model_name.two"
   value_two = fields.Char()

What i want to achieve, is by selecting "Model 1" or "Model 2" in the main model view, only the corresponding fields will be displayed and stored in the database.

But whenever i create a record for "SuperModel" both records are created in "ModelOne" and "ModelTwo" tables.

For example if i select "Model 1" and fill "value_one", when saving, an empty record is created in "Model 2" table (model_name_two_id == False). How can i prevent that ?

Thank you for helping :)