---
schema_version: "1"
id: 1cfde3456b70bb614c683053aad016927f4b209da4208218d6a8e197ac075a6e
title: Global Constants Flow Approval Processes Resource
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/platform/264-0-0/automate_automated_approvals_ref_resources_global_constants.md
canonical_url: https://help.salesforce.com/s/articleView?id=platform.automate_automated_approvals_ref_resources_global_constants.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 5b24f797c7aa0c8056ab6cea5ef27684f28a73f781e6ef7d31d5d31f1eea4436
description: Use fixed, system-provided values such as EmptyString, True, and False.
products:
  - Flow Builder
  - Salesforce Platform
release: "264"
---
# Global Constants Flow Approval Processes Resource

Use fixed, system-provided values such as `EmptyString`, `True`, and `False`.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition"><colgroup><col style="width:100%"></colgroup><tbody><tr class=""><td class="slds-cell-wrap" style="vertical-align:top;"><a href="https://help.salesforce.com/s/articleView?id=platform.automate_automated_approvals_about_supported_editions.htm&amp;release=264.0.0&amp;type=5" title="Review the supported products and editions for Flow Approval Processes.">View supported editions for Flow Approval Processes.</a></td></tr></tbody></table>

  
| Global Constant | Label | Supported Data Types |
| --- | --- | --- |
| `{!$GlobalConstant.True}` | True | `Boolean` |
| `{!$GlobalConstant.False}` | False | `Boolean` |
| `{!$GlobalConstant.EmptyString}` | Blank Value (Emtpy String) | `Text` |

![Example](https://sf-zdocs-cdn-prod.zoominsoftware.com/tdta-platform-platform_automation-264-0-0-production-enus/60568438-ec7e-4665-acd1-7c80dcbe60d5/images/icon_example.png)

Example

When you create a Boolean variable, `$GlobalConstant.True` and `$GlobalConstant.False` are supported. When you create a Currency variable, no global constants are supported.

## Null Versus Empty String

At run time, `{!$GlobalConstant.EmptyString}` and `null` are treated as separate, distinct values. For example:

- When you leave a text field or resource value blank, the value is `null` at run time. If you want the value to be treated as an empty string, set it to `{!$GlobalConstant.EmptyString}`.
- For a flow approval process condition, use the `is null` operator to check whether a value is `null`. If the condition compares two text variables, make sure that their default values are correctly set to `{!$GlobalConstant.EmptyString}` or left blank (`null`).