---
schema_version: "1"
id: 5181f323ff9bbef9aa9379f279a1ee6fe1eb979bd684ebc8d98660396b47ed2e
title: Synchronized Object Relationship Priority
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_cab_synch_object_relationship_priority.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_cab_synch_object_relationship_priority.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: deae90f079eb6152adeb30abee99a9ac58a86471cd8c1b3cbc395e31e7d276f4
description: Contact Builder supports a single relationship between objects in an attribute group. When you synchronize Marketing Cloud Engagement with object data from another cloud, Synchronized Data Sources creates that single relationship between attributes using a predetermined priority.
products:
  - Marketing
  - Marketing Cloud Engagement
release: "264"
---
# Synchronized Object Relationship Priority

Contact Builder supports a single relationship between objects in an attribute group. When you synchronize Marketing Cloud Engagement with object data from another cloud, Synchronized Data Sources creates that single relationship between attributes using a predetermined priority.

- Predefined standard object relationships
- Standard relationship fields, in alphabetical order
- Custom relationship fields, in alphabetical order

Here are the predefined standard object relationships between the User object and other objects.

 
| Other Cloud Object | Object Field |
| --- | --- |
| Account | OwnerId |
| Contact | OwnerId |
| Lead | OwnerId |
| Group | OwnerId |
| NetworkMember | MemberId |

Typically, custom objects include three relationship ID fields related to User: OwnerId, CreatedById, ModifiedById. Based on the synchronization priority, custom objects relate to User through the CreatedById field.

A relationship to Contact, Lead, or User is required for all synchronized objects. The order in which you sync objects affects the relationship direction in Engagement. Sync User, Contact, Lead, and Account before syncing other objects.

![Tip](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-mktg-mc_contact_data-264-0-0-production-enus/0e4d875c-8c8c-4be4-8f13-c8278eafbbf9/images/icon_tip.png)

Tip When you build a journey in Engagement, consider the synchronized object relationships to ensure that you include the appropriate Engagement contacts in the journey.