diff --git a/aleksis/apps/chronos/migrations/0009_automaticplan.py b/aleksis/apps/chronos/migrations/0009_automaticplan.py
index 26c97bb0133ea14814c279c598c81f04fe196ef6..573c87450c0e67d512b3024986e75fc0eb42d681 100644
--- a/aleksis/apps/chronos/migrations/0009_automaticplan.py
+++ b/aleksis/apps/chronos/migrations/0009_automaticplan.py
@@ -20,8 +20,7 @@ class Migration(migrations.Migration):
                 ('livedocument_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='resint.livedocument')),
                 ('number_of_days', models.PositiveIntegerField(default=1, validators=[django.core.validators.MinValueValidator(1)], verbose_name='Number of days shown in the plan')),
                 ('show_header_box', models.BooleanField(default=True, help_text='The header box shows affected teachers/groups.', verbose_name='Show header box')),
-                ('last_update_triggered_manually', models.BooleanField(default=False, verbose_name='Was the last update triggered manually?', editable=False)),
-                ('last_revision', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='reversion.revision', verbose_name='Revision which triggered the last update', editable=False)),
+                ('last_substitutions_revision', models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, to='reversion.revision', verbose_name='Revision which triggered the last update', editable=False)),
             ],
             options={
                 'verbose_name': 'Automatic plan',
diff --git a/aleksis/apps/chronos/models.py b/aleksis/apps/chronos/models.py
index 335e2bcf3dfffdaac9f8f0ab7f4d415ab8e7fd70..153979593ecbfef269f78b2dcf68db4ef79ce3b4 100644
--- a/aleksis/apps/chronos/models.py
+++ b/aleksis/apps/chronos/models.py
@@ -1136,7 +1136,7 @@ class AutomaticPlan(LiveDocument):
         verbose_name=_("Show header box"),
         help_text=_("The header box shows affected teachers/groups."),
     )
-    last_revision = models.ForeignKey(
+    last_substitutions_revision = models.ForeignKey(
         to=Revision,
         on_delete=models.SET_NULL,
         blank=True,
@@ -1145,10 +1145,6 @@ class AutomaticPlan(LiveDocument):
         editable=False,
     )
 
-    last_update_triggered_manually = models.BooleanField(
-        default=False, verbose_name=_("Was the last update triggered manually?"), editable=False
-    )
-
     @property
     def current_start_day(self) -> date:
         """Get first day which should be shown in the PDF."""
@@ -1174,9 +1170,9 @@ class AutomaticPlan(LiveDocument):
 
     def check_update(self, revision: Revision, versions: Iterable[Version]):
         """Check if the PDF file has to be updated and do the update then."""
-        if not self.last_revision or (
-            self.last_revision != revision
-            and revision.date_created > self.last_revision.date_created
+        if not self.last_substitutions_revision or (
+            self.last_substitutions_revision != revision
+            and revision.date_created > self.last_substitutions_revision.date_created
         ):
             update = False
             for version in versions:
@@ -1192,7 +1188,7 @@ class AutomaticPlan(LiveDocument):
 
             if update:
                 self.update(triggered_manually=False)
-                self.last_revision = revision
+                self.last_substitutions_revision = revision
                 self.save()
 
     def update(self, triggered_manually: bool = True):