TYPO3 Core

'l18n_parent' => array (
'displayCond' => 'FIELD:sys_language_uid:>:0',
'exclude' => 1,
'label' => 'LLL:EXT:lang/locallang_general.xml:LGL.l18n_parent',
"config" => Array (
"type" => "group",
"internal_type" => "db",
"allowed" => "tx_nbc2_chipset",
"size" => 1,
"minitems" => 0,
"maxitems" => 1,
'wizards' => array(
'suggest' => array(
'type' => 'suggest',
'default' => array(
'searchCondition' => 'sys_language_uid IN (-1,0)',
),
),
),
)
),

for example, but changing just the field from select to group and internal_type to db without the wizard also breaks it.