---
title: "Develop custom enrichment class"
slug: "develop-custom-enrichment-class"
description: "Learn to create custom enrichment rules using DQSCustomValidationBase, defining field values with custom classes and applying data types effectively."
tags: ["Task", "Data Quality Studio", "DQS"]
updated: 2026-03-20T08:37:01Z
published: 2026-03-20T17:44:40Z
canonical: "docs.staedean.com/develop-custom-enrichment-class"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.staedean.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Develop custom enrichment class

You can use a custom enrichment rule to set a field value using a custom class. To set up a custom enrichment rule, first develop the custom class to be applied.

The custom class must extend the **DQSCustomValidationBase** base class.

When you extend the **DQSCustomValidationBase** base class:

- Enter a unique and recognizable description() for the class. The description is shown in the lookup of the **Class name** field of a custom enrichment rule.
- Use these methods to indicate to which data the custom class applies:
  - **getTablesList()**: You can define the tables to which the custom class applies. As a result, you can select the custom class for a custom enrichment rule with one of the applicable tables defined.
  - **getExtendedDataTypesList()**: You can assign extended data types to which the custom class applies, for example, 'ExternalItemId'. As a result, you can select the custom class for a custom enrichment rule with a target field defined that uses the same extended data type.
  - **getBaseTypesList()**: You can define base data types to which the custom class applies, for example, **String** or **Date**. As a result, you can select the custom class for a custom enrichment rule with a target field defined with the same data type.
- Use the **processRecord()** method to define the x++ code that defines the return value that is used as input value for the target field of the enrichment rule.

The base structure of an extended **DQSCustomValidationBase** class is:

![](https://cdn.document360.io/da662430-6a41-47b1-8c7e-7e4ac37a9756/Images/Documentation/Images/File%20imageB07B4A86-9A4A-4136-8604-3E79186F3AB6)

## Related

- [Set up enrichment rule of type Custom](/set-up-enrichment-rule-of-type-custom.md)