diff --git a/argocd/deployment.yaml b/argocd/deployment.yaml
index 8128995..ab063f5 100644
--- a/argocd/deployment.yaml
+++ b/argocd/deployment.yaml
@@ -25,7 +25,7 @@ spec:
               mountPath: /data
       containers:
         - name: web
-          image: git.baumann.gr/adebaumann/vui:0.941
+          image: git.baumann.gr/adebaumann/vui:0.942
           imagePullPolicy: Always
           ports:
             - containerPort: 8000
diff --git a/dokumente/models.py b/dokumente/models.py
index 1b4b9da..13a95e7 100644
--- a/dokumente/models.py
+++ b/dokumente/models.py
@@ -60,7 +60,7 @@ class Vorgabe(models.Model):
     order = models.IntegerField()
     nummer = models.IntegerField()
     dokument = models.ForeignKey(Dokument, on_delete=models.CASCADE, related_name='vorgaben')
-    thema = models.ForeignKey(Thema, on_delete=models.PROTECT)
+    thema = models.ForeignKey(Thema, on_delete=models.PROTECT, blank=False)
     titel = models.CharField(max_length=255)
     referenzen = models.ManyToManyField(Referenz, blank=True)
     gueltigkeit_von = models.DateField()
@@ -132,13 +132,13 @@ class Vorgabe(models.Model):
                     })
         
         return conflicts
-    
+
     def clean(self):
         """
         Validate the Vorgabe before saving.
         """
         from django.core.exceptions import ValidationError
-        
+
         # Check for conflicts with existing Vorgaben
         conflicts = self.find_conflicts()
         if conflicts:
@@ -172,9 +172,9 @@ class Vorgabe(models.Model):
                     'vorgabe1': self,
                     'vorgabe2': other_vorgabe,
                     'conflict_type': 'date_range_intersection',
-                    'message': f"Vorgabe {self.Vorgabennummer()} conflicts with "
-                              f"existing {other_vorgabe.Vorgabennummer()} "
-                              f"due to overlapping validity periods"
+                    'message': f"Vorgabe {self.Vorgabennummer()} in Konflikt mit "
+                              f"bestehender {other_vorgabe.Vorgabennummer()} "
+                              f" - Geltungsdauer übeschneidet sich"
                 })
         
         return conflicts
diff --git a/dokumente/tests.py b/dokumente/tests.py
index a6d6f91..317df48 100644
--- a/dokumente/tests.py
+++ b/dokumente/tests.py
@@ -712,8 +712,8 @@ class VorgabeSanityCheckTest(TestCase):
         with self.assertRaises(Exception) as context:
             conflicting_vorgabe.clean()
         
-        self.assertIn('conflicts with existing', str(context.exception))
-        self.assertIn('overlapping validity periods', str(context.exception))
+        self.assertIn('Konflikt mit bestehender', str(context.exception))
+        self.assertIn('Geltungsdauer übeschneidet sich', str(context.exception))
     
     def test_check_vorgabe_conflicts_utility(self):
         """Test check_vorgabe_conflicts utility function"""
diff --git a/pages/templates/base.html b/pages/templates/base.html
index 1749be3..8dc8607 100644
--- a/pages/templates/base.html
+++ b/pages/templates/base.html
@@ -31,6 +31,6 @@
     <div class="flex-fill">{% block content %}Main Content{% endblock %}</div>
     <div class="col-md-2">{% block sidebar_right %}{% endblock %}</div>
 </div>
-<div>VorgabenUI v0.941</div>
+<div>VorgabenUI v0.942</div>
 </body>
 </html>