---
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title: Validate On-Demand Definitions with Data Preview
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/ind/264-0-0/dpe_on_demand_data_preview.md
canonical_url: https://help.salesforce.com/s/articleView?id=ind.dpe_on_demand_data_preview.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: b567c05b554b8e305486c8ca8088d04451133be2019f3004438828ff702677c9
description: Use Data Preview to inspect and validate node-level data transformations in an on-demand definition before you activate and run it. Data Preview for on-demand definitions follows the same workflow as standard Data Processing Engine Data Preview.
products:
  - Cross Cloud
release: "264"
---
# Validate On-Demand Definitions with Data Preview

Use Data Preview to inspect and validate node-level data transformations in an on-demand definition before you activate and run it. Data Preview for on-demand definitions follows the same workflow as standard Data Processing Engine Data Preview.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition"><colgroup><col></colgroup><tbody><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;"><a href="https://help.salesforce.com/s/articleView?id=ind.dpe_editions.htm&amp;release=264.0.0&amp;type=5" title="Review the supported editions and availability for Data Processing Engine (DPE).">View supported editions</a>.</td></tr></tbody></table>

To generate a preview, open an on-demand definition in the Data Processing Engine builder, configure input variables and data source filters, and click **Generate Data Preview**. Click each node on the canvas to review the transformed results. For detailed steps and settings, see [Validate Definition Design on the Data Processing Engine Builder with Data Preview](https://help.salesforce.com/s/articleView?id=ind.dpe_data_preview.htm&language=en_US).

## Data Preview Limitations for On-Demand Definitions

A few node types aren't supported in Data Preview for on-demand definitions. These nodes don't appear in the builder when you're in Data Preview mode:

- Context data source nodes
- Data source subtype nodes
- Composite writeback nodes

The limitations that apply to standard Data Processing Engine Data Preview also apply to on-demand definitions. For the full list, see the Data Preview Considerations and Limitations section in [Validate Definition Design on the Data Processing Engine Builder with Data Preview](https://help.salesforce.com/s/articleView?id=ind.dpe_data_preview.htm&language=en_US).