diff --git a/jdav_web/finance/admin.py b/jdav_web/finance/admin.py
index 14e76eb..308e9e3 100644
--- a/jdav_web/finance/admin.py
+++ b/jdav_web/finance/admin.py
@@ -65,7 +65,7 @@ def decorate_statement_view(model, perm=None):
 @admin.register(Statement)
 class StatementAdmin(CommonAdminMixin, admin.ModelAdmin):
     fields = ['short_description', 'explanation', 'excursion', 'status']
-    list_display = ['__str__', 'excursion', 'total_pretty', 'created_by', 'submitted_date', 'is_valid', 'status_badge']
+    list_display = ['__str__', 'total_pretty', 'created_by', 'submitted_date', 'is_valid', 'status_badge']
     list_filter = ['status']
     search_fields = ('excursion__name', 'short_description')
     ordering = ['-submitted_date']
@@ -90,6 +90,16 @@ class StatementAdmin(CommonAdminMixin, admin.ModelAdmin):
             obj.created_by = request.user.member
         super().save_model(request, obj, form, change)
 
+    def get_fields(self, request, obj=None):
+        if obj is not None and obj.excursion:
+            # if the object exists and an excursion is set, show the excursion (read only)
+            # instead of the short description
+            return ['excursion', 'explanation', 'status']
+        else:
+            # if the object is newly created or no excursion is set, require
+            # a short description
+            return ['short_description', 'explanation', 'status']
+
     def get_readonly_fields(self, request, obj=None):
         readonly_fields = ['status', 'excursion']
         if obj is not None and obj.submitted:
diff --git a/jdav_web/finance/locale/de/LC_MESSAGES/django.po b/jdav_web/finance/locale/de/LC_MESSAGES/django.po
index 4895706..4dfdc5a 100644
--- a/jdav_web/finance/locale/de/LC_MESSAGES/django.po
+++ b/jdav_web/finance/locale/de/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-10-12 11:37+0200\n"
+"POT-Creation-Date: 2025-10-16 23:09+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -48,10 +48,6 @@ msgstr "Kostenübersicht"
 msgid "Submit statement"
 msgstr "Rechnung einreichen"
 
-#: finance/admin.py
-msgid "Length"
-msgstr "Länge"
-
 #: finance/admin.py
 #, python-format
 msgid "%(name)s is not yet submitted."
@@ -180,6 +176,10 @@ msgstr "Bestätigung zurücknehmen"
 msgid "Download summary"
 msgstr "Beleg herunterladen"
 
+#: finance/admin.py
+msgid "Length"
+msgstr "Länge"
+
 #: finance/apps.py
 msgid "Finance"
 msgstr "Finanzen"
@@ -291,11 +291,6 @@ msgstr "Abrechnung"
 msgid "Statements"
 msgstr "Abrechnungen"
 
-#: finance/models.py
-#, python-format
-msgid "Statement: %(excursion)s"
-msgstr "Abrechnung: %(excursion)s"
-
 #: finance/models.py
 #, python-format
 msgid "Excursion %(excursion)s"
diff --git a/jdav_web/finance/models.py b/jdav_web/finance/models.py
index 13d68e0..4d3b946 100644
--- a/jdav_web/finance/models.py
+++ b/jdav_web/finance/models.py
@@ -62,7 +62,7 @@ class Statement(CommonModel):
 
     short_description = models.CharField(verbose_name=_('Short description'),
                                          max_length=30,
-                                         blank=True)
+                                         blank=False)
     explanation = models.TextField(verbose_name=_('Explanation'), blank=True)
 
     excursion = models.OneToOneField(Freizeit, verbose_name=_('Associated excursion'),
@@ -129,12 +129,6 @@ class Statement(CommonModel):
             'delete_obj': not_submitted & (is_creator | leads_excursion | has_global_perm('finance.delete_global_statement')),
         }
 
-    def __str__(self):
-        if self.excursion is not None:
-            return _('Statement: %(excursion)s') % {'excursion': str(self.excursion)}
-        else:
-            return self.short_description
-
     @property
     def title(self):
         if self.excursion is not None:
@@ -142,6 +136,9 @@ class Statement(CommonModel):
         else:
             return self.short_description
 
+    def __str__(self):
+        return str(self.title)
+
     @property
     def submitted(self):
         return self.status == Statement.SUBMITTED or self.status == Statement.CONFIRMED
@@ -664,7 +661,7 @@ class StatementConfirmed(Statement):
 
 class Bill(CommonModel):
     statement = models.ForeignKey(Statement, verbose_name=_('Statement'), on_delete=models.CASCADE)
-    short_description = models.CharField(verbose_name=_('Short description'), max_length=30)
+    short_description = models.CharField(verbose_name=_('Short description'), max_length=30, blank=False)
     explanation = models.TextField(verbose_name=_('Explanation'), blank=True)
 
     amount = models.DecimalField(verbose_name=_('Amount'), max_digits=6, decimal_places=2, default=0)
diff --git a/jdav_web/finance/tests/admin.py b/jdav_web/finance/tests/admin.py
index 38a62c0..996074d 100644
--- a/jdav_web/finance/tests/admin.py
+++ b/jdav_web/finance/tests/admin.py
@@ -102,6 +102,14 @@ class StatementUnSubmittedAdminTestCase(AdminTestCase):
         request.user = self.superuser
         self.assertTrue(self.admin.has_delete_permission(request, self.statement))
 
+    def test_get_fields(self):
+        """Test get_fields when excursion is set or not set."""
+        request = self.factory.post('/')
+        request.user = self.superuser
+        self.assertIn('excursion', self.admin.get_fields(request, self.statement_with_excursion))
+        self.assertNotIn('excursion', self.admin.get_fields(request, self.statement))
+        self.assertNotIn('excursion', self.admin.get_fields(request))
+
     def test_get_inlines(self):
         """Test get_inlines"""
         request = self.factory.post('/')