This article is a supplement to the ServiceNow documentation. For full documentation please refer ServiceNow official website
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Data Policy

Create Data Policies to enforce consistency.

Data Policy is used to set mandatory and read-only states on form fields.

Data policies can be used on lists to make filed read-only. The field will appear to be editable, but the update will fail.

The purpose of a Data policy is to standardize the same data across Service Now applications. Data Policy controls are similar to UI Policy controls, but UI policies are enforced only on data that passes through the browser and UI.

A Data policy enforces requirements on filed and record data when the data is imported into service now or when the data in an Import Set is submitted through and external system

UI and Data Policies are not about security. They are about managing the user experience.