---
title: Define the source specifications in the compatibility rules
description: Define a source specification in a compatibility rule so that you can create a horizontal relationship in your product catalog.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/telecom-media-technology/order-mgt-define-source-specifications.html
release: australia
topic_type: task
last_updated: "2026-03-12"
reading_time_minutes: 1
breadcrumb: [Create compatibility rule, Configuring compatibility rules, Product offerings and catalogs, Configure, Sales Customer Relationship Management for Telecommunications, Telecommunications, Media, and Technology \(TMT\)]
---

# Define the source specifications in the compatibility rules

Define a source specification in a compatibility rule so that you can create a horizontal relationship in your product catalog.

## Before you begin

Ensure that you have created a compatibility rule. To learn more, see [Create a compatibility rule](https://raw.githubusercontent.com/ServiceNow/ServiceNowDocs/australia/markdown/telecom-media-technology/create-compatibility-rules.md).

Role required: sn\_prd\_pm.product-catalog\_manager, sn\_prd\_pm\_adv.catalog\_creator

## About this task

A source specification record includes the details of a source product inventory item in the compatibility rule. After you create a compatibility rule, you can configure the characteristics of your source specification.

## Procedure

1.  Navigate to **All** > **Product Catalog Management** > **Compatibility Rule**.

2.  In the Compatibility Rules list, select the compatibility rule that you want to define the source specification for.

3.  On the form, select the Source Configuration related list.

4.  Select **New** and fill in the fields.

<table id="table_lv4_wrj_5tb"><thead><tr><th>

Field

</th><th>

Description

</th></tr></thead><tbody><tr><td>

Specification

</td><td>

Based on the specification that you selected when you created the compatibility rule, this field auto-populates with your product, service, or resource specification.

</td></tr><tr><td>

Characteristic

</td><td>

Characteristic to define the source specification in the compatibility rule.Select the characteristic that is associated with the product, service, or resource specification.

</td></tr><tr><td>

Characteristic Option

</td><td>

Characteristic option to define the source specification in the compatibility rule.Select the characteristic options that are associated with the product, service, or resource specification.

</td></tr></tbody>
</table>5.  Select **Submit**.


## What to do next

.