---
schema_version: "1"
id: b131b0ae475a2166d8c1f0ae59aed08ee1a48661536c5b75895fc6502c14542d
title: Header Rule
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/ind/264-0-0/comms_header_rule.md
canonical_url: https://help.salesforce.com/s/articleView?id=ind.comms_header_rule.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 37989528ca8d836db163c9ac080fcec3c12d36b347105a8007bbdb1f359c5573
description: To configure which rule is executed first when you have multiple children rules in a rule set, you can specify one of the rules as the header rule. If the header rule does not pass, processing stops on the entire rule set. Using header rules enables you to optimize rule set evaluation.
products:
  - Communications
  - Media
  - Energy and Utilities
release: "264"
---
# Header Rule

To configure which rule is executed first when you have multiple children rules in a rule set, you can specify one of the rules as the header rule. If the header rule does not pass, processing stops on the entire rule set. Using header rules enables you to optimize rule set evaluation.

## Header Rule Processing Logic

When a header rule exists, the rules engine processes it using an AND expression with the children rules' expression mode. The header rule must pass before the rules engine evaluates the children rules using the expression mode declared in the rule set, which can be And, Or, Custom, If Else If, or If.

**Header Rule Processing Logic**

![Figure is described in preceding text.](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-ind-comms_media_energy_managed-264-0-0-production-enus/ff4079f6-a384-475c-b863-578bbbb0ef9b/resources-product/images/header_rule.jpg)

## Setting a Header Rule

Set a header rule using the **Header Rule Lookup** dialog box in the rule set **General Properties** facet.

**Setting a Header Rule in the Rule Set General Properties Facet**

![Set a Header Rule in the Rule Set General Properties Facet.](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-ind-comms_media_energy_managed-264-0-0-production-enus/ff4079f6-a384-475c-b863-578bbbb0ef9b/resources-product/images/header_rule_assign.jpg)