Implement Enumeration
For a better workflow you should implement your types as Enumeration. The following example is a possible Guide for getting all work.
EXT:example/Classes/Domain/Enumeration/CategoryTypes.php
namespace FGTCLB\Example\Domain\Enumeration;
use TYPO3\CMS\Core\Type\Enumeration;
class Category extends Enumeration
{
public const TYPE_ADMISSION_RESTRICTION = 'admission_restriction';
public const TYPE_APPLICATION_PERIOD = 'application_period';
public const TYPE_BEGIN_COURSE = 'begin_course';
public const TYPE_COSTS = 'costs';
public const TYPE_DEGREE = 'degree';
public const TYPE_DEPARTMENT = 'department';
public const TYPE_STANDARD_PERIOD = 'standard_period';
public const TYPE_COURSE_TYPE = 'course_type';
public const TYPE_TEACHING_LANGUAGE = 'teaching_language';
public const TYPE_TOPIC = 'topic';
}
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