Hi, @mbourla . You are right that the logic is done by the mentioned scheduled job. And it is all hardcoded. Trying to do it by custom script is possible but very, very bad from the performance perspective (I did that about 5 years ago). Now you have baseline solutions available that take care about the synchronization in a fully optimized way. Calculated Application Service is doing near-to-realtime sync between relationships and CI Associations. Please check my another article https://www.servicenow.com/community/common-service-data-model/application-services-how-to-use-them/... for more details.