TYPO3 Core

I have set 'label' to a text field called 'title' - works.
I have set 'label_alt' to a field of type 'group/db' and
'label_alt_force' to 'TRUE' - does not work.

Instead of displaying the label field of the other table
the raw value (the record's uid) is shown.

The record gets listed this way in the backend:
"My record's title, 23"

Instead of 23 the relation should get resolved to the
record of the other table and the label-field's value should be shown.

I'll post the TCA as additional information here,
the field 'client' is the one which doesn't get resolved.
Instead only the id of the record is shown.

I think this behaves correct if using a field
of type 'select' instead of 'group'.

$TCA['tx_hypeshowcase_domain_model_project'] = array(
'ctrl' => array(
'title' => 'LLL:EXT:hype_showcase/Resources/Private/Language/locallang_db.xml:tx_hypeshowcase_domain_model_project',
'label' => 'title',
'label_alt' => 'client',
'label_alt_force' => TRUE,
'tstamp' => 'tstamp',
'crdate' => 'crdate',
'cruser_id' => 'cruser_id',
'sortby' => 'sorting',
'delete' => 'deleted',
'enablecolumns' => array(
'disabled' => 'hidden',
'starttime' => 'starttime',
'endtime' => 'endtime',
),
'dynamicConfigFile' => t3lib_extMgm::extPath($_EXTKEY) . 'Configuration/TCA/tca.php',
'iconfile' => t3lib_extMgm::extRelPath($_EXTKEY) . 'Configuration/TCA/Icons/project.png',
'dividers2tabs' => TRUE,
),
);
(issue imported from #M16716)