[add] onchange to empty type contact when change company_type

models/res_partner.py

@@ -153,6 +153,10 @@ class ModelName(models.Model):
     # ------------------------------------------------------
     # Onchange / Constraints
     # ------------------------------------------------------
+    @api.onchange('company_type')
+    def onchange_company_type(self):
+        self.type_id = None
+
     @api.onchange('type_id')
     def onchange_type(self):
         self.subtype_id = None