diff --git a/application/controllers/api/frontend/v1/Ort.php b/application/controllers/api/frontend/v1/Ort.php
index 81ae8d810..e936686be 100644
--- a/application/controllers/api/frontend/v1/Ort.php
+++ b/application/controllers/api/frontend/v1/Ort.php
@@ -454,7 +454,7 @@ class Ort extends FHCAPI_Controller
 
 		$reservationsCount = hasData($reservationsResult) ? getData($reservationsResult)[0]->count : 0;
 		if ($reservationsCount > 0) {
-			$this->terminateWithError("Cannot delete room with shortcode $ort_kurzbz because there are existing reservations for this room", self::ERROR_TYPE_GENERAL);
+			$this->terminateWithError($this->p->t('ui', 'error_existingReservationsForRoomsUponDeletion'), self::ERROR_TYPE_GENERAL);
 		}
 
 		$softwareImageOrtQuery = "SELECT COUNT(*) FROM extension.tbl_softwareimage_ort WHERE ort_kurzbz = ?";
@@ -465,7 +465,14 @@ class Ort extends FHCAPI_Controller
 
 		$softwareImageOrtCount = $softwareImageOrtResult->row()->count;
 		if ($softwareImageOrtCount > 0) {
-			$this->terminateWithError($this->p->t('ui', 'error_existingReservationsForRoomsUponDeletion'), self::ERROR_TYPE_GENERAL);
+			$this->terminateWithError($this->p->t('ui', 'error_existingSoftwareImageForRoomTypeUponDeletion'), self::ERROR_TYPE_GENERAL);
+		}
+
+		$subRoomsCountQuery = "SELECT COUNT(*) FROM public.tbl_ort WHERE parent_ort_kurzbz = ?";
+		$subRoomsCountQuery = $this->OrtModel->execReadOnlyQuery($subRoomsCountQuery, [$ort_kurzbz]);
+		$subRoomsCount = hasData($subRoomsCountQuery) ? getData($subRoomsCountQuery)[0]->count : 0;
+		if ($subRoomsCount > 0) {
+			$this->terminateWithError($this->p->t('ui', 'error_existingSubRoomsForRoomUponDeletion'), self::ERROR_TYPE_GENERAL);
 		}
 
 		$result = $this->OrtModel->delete([
diff --git a/system/phrasesupdate.php b/system/phrasesupdate.php
index 323126d1c..b00ddf347 100644
--- a/system/phrasesupdate.php
+++ b/system/phrasesupdate.php
@@ -58877,6 +58877,26 @@ I have been informed that I am under no obligation to consent to the transmissio
 			)
 		)
 	),
+	array(
+		'app' => 'core',
+		'category' => 'ui',
+		'phrase' => 'error_existingSubRoomsForRoomUponDeletion',
+		'insertvon' => 'system',
+		'phrases' => array(
+			array(
+				'sprache' => 'German',
+				'text' => 'Es gibt bestehende Unterräume für diesen Raum. Bitte entfernen Sie die Unterräume, bevor Sie den Raum löschen.',
+				'description' => '',
+				'insertvon' => 'system'
+			),
+			array(
+				'sprache' => 'English',
+				'text' => 'There are existing sub-rooms for this room. Please remove the sub-rooms before deleting the room.',
+				'description' => '',
+				'insertvon' => 'system'
+			)
+		)
+	),
 	array(
 		'app' => 'core',
 		'category' => 'ui',