---
title: "Breaking: #109849 - Removed \"buildFormDefinitionValidationConfiguration\" hook"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-109849-1716115200"
source: "Changelog/15.0/Breaking-109849-RemovedBuildFormDefinitionValidationConfigurationHook.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Breaking: #109849 - Removed "buildFormDefinitionValidationConfiguration" hook

See [forge#109849](https://forge.typo3.org/issues/109849)

## Description

The hook `$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['buildFormDefinitionValidationConfiguration']`
has been removed in favor of the new PSR-14 event
`\TYPO3\CMS\Form\Event\AfterFormDefinitionValidationConfigurationIsBuiltEvent`.

## Impact

Any hook implementation registered under this identifier will no longer be
executed.

## Affected installations

TYPO3 installations with custom extensions that register a hook class under
`$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['buildFormDefinitionValidationConfiguration']`
are affected.

## Migration

The hook has been removed without a deprecation phase to allow extensions to
remain compatible with both TYPO3 v14 (using the hook) and v15+ (using the
new event). Implementing the PSR-14 event provides the same or greater control.

Use the [AfterFormDefinitionValidationConfigurationIsBuiltEvent](https://docs.typo3.org/permalink/changelog:feature-109849-1716115200)
to achieve the same functionality with the new event-based system.