---
category: [Administration & Integrations, Platform and Product Extensions, Platform and Product Extensions/Integration, Administration & Integrations/Custom Integrations & Apps, Platform and Product Extensions/Workday Extend]
keyword: Extend
nav: wcp_docs
parent_url: /wcp_docs/
title: >- 
  Concept: Custom Objects
layout: subsection
---

Custom objects are sets of custom fields that you can create to capture unique data. You can configure security domains for custom objects, and you can use custom objects in business processes and reports.

<b>Note:</b> You can only use custom objects with Workday-delivered business objects. To define your own, standalone business objects in Workday Extend apps, add business objects in App Builder.

You can configure sets of custom fields to suit your environment. There are 6 different field types:

-   Currency
-   Decimal
-   Integer
-   List
-   Paragraph Text
-   Text


Custom lists enable you to enter a unique set of values. You can share custom lists across multiple custom objects. You can:

-   Add or remove custom fields as needed.
-   Create single- or multi-instance instance custom objects.
-   Create your own user-defined validation rules.
-   Provide help text.
-   Specify the custom field order.
-   Use delivered validations (Example: Required).


Each custom object has its own security.

To determine the web service alias of a custom object definition in Workday, access the <b>View Custom Object</b> task. You can use the web service alias to access the <i>customObjects</i> REST API.

## <a id="section_ryq_kfd_f2b"></a>Custom Objects and Security Domains

Users and groups with access on the <i>Custom Object Management</i> domain can view and modify custom object definitions.

You manage security for custom objects and fields at the custom object level. Custom fields for a custom object inherit their security from the custom object.

When you create a custom object, you must secure it to a domain. When you register your API client, verify that the selected Scope (the Functional Area) includes the security domains for the custom objects.

## <a id="section_gyd_sfd_f2b"></a>Permissions Affecting Custom Objects

Users with view permission on security domains for a custom object can view:

-   Custom fields on a report.
-   Custom object data.
-   Custom fields on the <b>Additional Data</b> tab on these profiles:

    -   Academic unit
    -   Academic unit hierarchy
    -   Job profile
    -   Job requisition
    -   Position restriction
    -   Worker



Users with modify permission can edit custom object data.

Integration permissions control whether an integration can get or put data. You can create an integration when you don't have access on the custom object integration domains.

Example: An integration partner can create and run an inbound Enterprise Interface Builder (EIB) that includes custom fields that the partner can access. However, the inbound EIB updates values only for:

-   Custom fields for which the worker has put access.
-   nterprise workers that the worker has access to through a constrained integration system security group (Constrained).


To view the security policy on a custom object, select <b>Security</b> &gt; <b>View Security</b> as a related action on the custom object. When you view a security domain, Workday displays any custom objects that the domain secures. To view the associated custom fields, select the custom object.

### Related Information

[Administrator Guide: Create and Edit Custom Object Definitions](https://doc.workday.com/access/sources/dita/topic?wd:docset=adminguide&ft:locale=en-US&resourceid=dan1370797402608)

[Administrator Guide: Reference: Custom Objects (Single-Instance)](https://doc.workday.com/access/sources/dita/topic?wd:docset=adminguide&ft:locale=en-US&resourceid=dan1370797988038)

[Administrator Guide: Reference: Custom Objects (Multi-Instance)](https://doc.workday.com/access/sources/dita/topic?wd:docset=adminguide&ft:locale=en-US&resourceid=hug1376597171643)

[Administrator Guide: Reference: Custom Object Definitions](https://doc.workday.com/access/sources/dita/topic?wd:docset=adminguide&ft:locale=en-US&resourceid=dan1370797987670)