diff --git a/application/controllers/api/frontend/v1/stv/Prestudent.php b/application/controllers/api/frontend/v1/stv/Prestudent.php
index 5917ae8f1..df8b14710 100644
--- a/application/controllers/api/frontend/v1/stv/Prestudent.php
+++ b/application/controllers/api/frontend/v1/stv/Prestudent.php
@@ -57,9 +57,19 @@ class Prestudent extends FHCAPI_Controller
 
 	public function updatePrestudent($prestudent_id)
 	{
+		$this->load->model('crm/Prestudent_model', 'PrestudentModel');
+
+		// UDF
+		$this->load->library('UDFLib');
+		
+		$result = $this->udflib->getCiValidations($this->PrestudentModel, $this->input->post());
+		$udf_field_validations = $this->getDataOrTerminateWithError($result);
+
 		//Form validation
 		$this->load->library('form_validation');
 
+		$this->form_validation->set_rules($udf_field_validations);
+
 		$this->form_validation->set_rules('priorisierung', 'Priorisierung', 'numeric', [
 			'numeric' => $this->p->t('ui', 'error_fieldNotNumeric', ['field' => 'Priorisierung'])
 		]);
@@ -105,6 +115,14 @@ class Prestudent extends FHCAPI_Controller
 			'standort_code'
 		];
 
+		// add UDFs
+		$result = $this->udflib->getDefinitionForModel($this->PrestudentModel);
+
+		$definitions = $this->getDataOrTerminateWithError($result);
+
+		foreach ($definitions as $def)
+			$array_allowed_props_prestudent[] = $def['name'];
+
 		$update_prestudent = array();
 		foreach ($array_allowed_props_prestudent as $prop)
 		{
diff --git a/application/controllers/api/frontend/v1/stv/Student.php b/application/controllers/api/frontend/v1/stv/Student.php
index 2f7b02972..89c317ae4 100644
--- a/application/controllers/api/frontend/v1/stv/Student.php
+++ b/application/controllers/api/frontend/v1/stv/Student.php
@@ -143,9 +143,9 @@ class Student extends FHCAPI_Controller
 		$result = $this->udflib->getCiValidations($this->PersonModel, $this->input->post());
 
 		//TODO(Manu) check with Chris: input number not allowed
-		$field_validations = $this->getDataOrTerminateWithError($result);
+		$udf_field_validations = $this->getDataOrTerminateWithError($result);
 
-		$this->form_validation->set_rules($field_validations);
+		$this->form_validation->set_rules($udf_field_validations);
 
 		if (!$this->form_validation->run())
 			$this->terminateWithValidationErrors($this->form_validation->error_array());
diff --git a/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js b/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js
index 6857bef0b..e6db926cc 100644
--- a/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js
+++ b/public/js/components/Stv/Studentenverwaltung/Details/Prestudent.js
@@ -2,11 +2,14 @@ import FormForm from '../../../Form/Form.js';
 import FormInput from '../../../Form/Input.js';
 import TblHistory from "./Prestudent/History.js";
 
+import CoreUdf from '../../../Udf/Udf.js';
+
 export default {
 	components: {
 		FormForm,
 		FormInput,
-		TblHistory
+		TblHistory,
+		CoreUdf
 	},
 	inject: {
 		lists: {
@@ -98,6 +101,9 @@ export default {
 				})
 				.catch(this.$fhcAlert.handleSystemError);
 		},
+		udfsLoaded(udfs) {
+			this.initialFormData = {...(this.initialFormData || {}), ...udfs};
+		},
 		updatePrestudent(){
 			this.$refs.form
 				.post('api/frontend/v1/stv/prestudent/updatePrestudent/' + this.modelValue.prestudent_id, this.deltaArray)
@@ -505,6 +511,7 @@ export default {
 						>
 					</form-input>
 				</div>
+				<core-udf @load="udfsLoaded" v-model="data" class="row-cols-3 g-3 mb-3" ci-model="crm/prestudent" :pk="{prestudent_id:modelValue.prestudent_id}"></core-udf>
 			</fieldset>
 		</form-form>
 		<div>