---
schema_version: "1"
id: 86320d7f61f154be959d1f6ebc441412ebef6eabd6d130e62b6cc99a14182924
title: Fully Qualified Keys in Data Objects
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/data/264-0-0/c360_a_dlo_dmo_key_qualifiers.md
canonical_url: https://help.salesforce.com/s/articleView?id=data.c360_a_dlo_dmo_key_qualifiers.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: bec645a1cffda2ccfb54403a7cadeef84d43b6f907ace89e8ba1dfa1dc639175
description: Data 360 adds key qualifier fields to data lake objects (DLOs) and data model objects (DMOs). Key qualifier fields can also be added when you create object relationships and object mappings between DLOs and DMOs.
products:
  - Data 360
release: "264"
---
# Fully Qualified Keys in Data Objects

Data 360 adds key qualifier fields to data lake objects (DLOs) and data model objects (DMOs). Key qualifier fields can also be added when you create object relationships and object mappings between DLOs and DMOs.

## Key Qualifier Fields in DLOs

Data 360 adds key qualifier fields to DLO fields that contain either a primary key or a foreign key. The default value stored in a key qualifier field is null. You must create and configure key qualifiers for each DLO field that contains either a primary or foreign key.

A DLO’s primary key field is determined when the DLO is created. Data 360 determines that a DLO field is a foreign key field when the field is mapped to a DMO field and the DMO field is included in an object relationship.

Data 360 also adds field mappings between DLO and DMO key qualifier fields. These mappings are internally managed and aren’t listed on the field-mapping page.

## Key Qualifier Fields in DMOs

Data 360 adds a key qualifier field for each primary key field in a DMO and for each DMO field that’s participating in an object relationship. However, regardless of how many relationships a specific DMO field is part of, the field has only one key qualifier field.

When a new DMO is created, a key qualifier field is automatically added to the DMO’s primary key field. When a new object relationship is activated, key qualifier fields can be added to the DMOs that are linked in the object relationship if those DMO fields don’t have corresponding key qualifier fields. Key qualifier fields and their associated DMO fields are listed in the Key Qualifier column on the DMO record home page.

Because a fully qualified key is composed of a source provided key and a key qualifier, a DMO relationship also uses a composite key consisting of a key field and a key qualifier field. On the DMO record home page, the object relationship summary view shows the key qualifier fields that are part of each object relationship.

![Image shows which key qualier fields are included in dmo relationships.](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-data-data_cloud-264-0-0-production-enus/f3569962-3c9b-4f83-9d0c-b6a574e785da/data_cloud/images/dmo-dmo-keyqualifier.png)

#### See Also

- [_Salesforce Help_: Configure a Key Qualifier Field](https://help.salesforce.com/s/articleView?id=data.c360_a_add_or_view_key_qualifier.htm&release=264.0.0&type=5 "After creating a data stream, add key qualifiers to your data lake object (DLO) fields to create fully qualified keys (FQK). Configure key qualifiers for all DLO fields that contain either a primary or foreign key. You can add up to 20 active key qualifiers. A key qualifier is active when it's used for a DLO field. Data 360 automatically adds and removes key qualifiers to and from data model object (DMO) fields. You can't edit these system fields.")