---
title: "Breaking: #79243 - Remove l10n_mode mergeIfNotBlank"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-79243"
source: "Changelog/8.6/Breaking-79243-RemoveL10n_modeMergeIfNotBlank.rst"
modified: "2026-09-14T09:47:36+00:00"
---

# Breaking: #79243 - Remove l10n_mode mergeIfNotBlank

See [forge#79243](https://forge.typo3.org/issues/79243)

## Description

The setting `mergeIfNotBlank` has been removed without replacement from the list of possible values of
the TCA column property `l10n_mode`.

## Impact

Previously values of a localization having a dependent parent record were taken
from the parent record if `l10n_mode` for the particular field was set to
`mergeIfNotBlank` and the value in the localization was empty. Now, this value
is duplicated during the creation of the localized record and has to be
modified manually if required.

## Affected Installations

All instances with extensions setting TCA options and having
`$GLOBALS['TCA'][<table-name>]['columns'][<column-name>]['l10n_mode']` set to `mergeIfNotBlank`.

## Migration

First execute the upgrade wizard
**Migrate values in database records having "l10n_mode" set** in the install tool.
After that, remove `$GLOBALS['TCA'][<table-name>]['columns'][<column-name>]['l10n_mode']`
if it is set to `mergeIfNotBlank`. If `l10n_mode` is removed before the upgrade wizard
has been executed, nothing will be migrated - thus, it's important to keep that order
of migration.

The upgrade wizard executes the following field usages:

-   inline children, pointing to `sys_file_reference`:
    file references are localized for the localization, if missing there
-   group fields, basically not using MM intermediate tables:
    value is cloned to the accordant field in the localization, if empty there
-   any other field type:
    value is cloned to the accordant field in the localization, is blank there

The term `blank` refers to an empty string (`''`), `empty` refers to an empty
string, null values and zero values (numeric and string).