diff --git a/backend/services/diaryDateActivityService.js b/backend/services/diaryDateActivityService.js
index 9719e5e..5e66b98 100644
--- a/backend/services/diaryDateActivityService.js
+++ b/backend/services/diaryDateActivityService.js
@@ -39,7 +39,34 @@ class DiaryDateActivityService {
             console.log('[DiaryDateActivityService::updateActivity] - activity not found');
             throw new Error('Activity not found');
         }
-        console.log('[DiaryDateActivityService::updateActivity] - update activity');
+
+        // Wenn customActivityName gesendet wird, müssen wir die PredefinedActivity behandeln
+        if (data.customActivityName) {
+            console.log('[DiaryDateActivityService::updateActivity] - handling customActivityName:', data.customActivityName);
+            
+            // Suche nach einer existierenden PredefinedActivity mit diesem Namen
+            let predefinedActivity = await PredefinedActivity.findOne({ 
+                where: { name: data.customActivityName } 
+            });
+            
+            if (!predefinedActivity) {
+                // Erstelle eine neue PredefinedActivity
+                console.log('[DiaryDateActivityService::updateActivity] - creating new PredefinedActivity');
+                predefinedActivity = await PredefinedActivity.create({
+                    name: data.customActivityName,
+                    description: '',
+                    duration: data.duration || activity.duration
+                });
+            }
+            
+            // Setze die predefinedActivityId
+            data.predefinedActivityId = predefinedActivity.id;
+            
+            // Entferne customActivityName aus den zu aktualisierenden Daten
+            delete data.customActivityName;
+        }
+
+        console.log('[DiaryDateActivityService::updateActivity] - update activity', clubId, id, data, JSON.stringify(data));
         return await activity.update(data);
     }
 
diff --git a/frontend/src/views/DiaryView.vue b/frontend/src/views/DiaryView.vue
index 844ea8c..49908eb 100644
--- a/frontend/src/views/DiaryView.vue
+++ b/frontend/src/views/DiaryView.vue
@@ -1151,12 +1151,25 @@ export default {
                     durationText: item.durationText,
                     groupId: item.groupId,
                 });
+                
+                // Lade die Daten neu, um die Änderungen anzuzeigen
+                await this.loadTrainingPlan();
+                
                 this.editingActivityId = null;
             } catch (error) {
                 alert('Ein Fehler ist aufgetreten. Bitte versuchen Sie es erneut.');
             }
         },
 
+        async loadTrainingPlan() {
+            try {
+                this.trainingPlan = await apiClient.get(`/diary-date-activities/${this.currentClub}/${this.date.id}`).then(response => response.data);
+                this.calculateIntermediateTimes();
+            } catch (error) {
+                console.error('Fehler beim Laden des Trainingsplans:', error);
+            }
+        },
+
         cancelActivityEdit() {
             this.editingActivityId = null;
         },