I have this issue with the res.partner model.

The code:
`
class Patient(models.Model):
	​_inherit='res.partner'
	​_description='Laboratory Patient'
	​patient_name=fields.Char(string='Patient Name',help='Name of the patient',required=True)
	​gender_id=fields.Many2one('laboratory.genders',string='Patient Gender',required=True,)`	​

The error:

2023-04-15 00:34:56,456 205456 ERROR lims_empty odoo.schema: Table 'res_partner': unable to set NOT NULL on column 'gender_id' 
2023-04-15 00:34:56,459 205456 ERROR lims_empty odoo.schema: Table 'res_partner': unable to set NOT NULL on column 'patient_name'