code: def save(self):  # pylint: disable=arguments-differ
          
          course_id = self.validated_data['course_id']
  
          __, created = models.EnterpriseCourseEnrollment.objects.get_or_create(
              enterprise_customer_user=self.enterprise_customer_user,
              course_id=course_id,
          )
          if created:
              track_enrollment('rest-api-enrollment', self.enterprise_customer_user.user_id, course_id)
docs: Save the model with the found EnterpriseCustomerUser.