createOptionForm - item not automatically selected

Forms\Components\Select::make('descr_id')
    ->relationship(name: 'descrizione', titleAttribute: 'descr')
    ->createOptionForm([
        Forms\Components\TextInput::make('descr'),
    ]),

//model
public function descrizione()
    {
        return $this->belongsTo(MalerbaPagamentiDescr::class, 'descr_id','id');
    }