diff --git a/install/upgrade/upgrade.md b/install/upgrade/upgrade.md
index 5f30224dc..0a7b5e141 100644
--- a/install/upgrade/upgrade.md
+++ b/install/upgrade/upgrade.md
@@ -17,6 +17,9 @@ then run the database upgrade script, then restart Apache:
     sudo python3 install/upgrade/database_upgrade.py
     sudo service apache2 restart
 
+### 8.4.0 to 8.4.1
+A code base update (e.g. with git pull) and a webserver restart is sufficient.
+
 ### 8.3.0 to 8.4.0
 8.4.0.sql is needed but will be taken care of by the database upgrade script.
 
diff --git a/openatlas/forms/add_fields.py b/openatlas/forms/add_fields.py
index 1ac0ccefe..d2efed0ab 100644
--- a/openatlas/forms/add_fields.py
+++ b/openatlas/forms/add_fields.py
@@ -261,4 +261,4 @@ class AddDynamicType(FlaskForm):
                 setattr(
                     manager.form_class,
                     str(type_.id),
-                    TreeField(str(type_.id), validators))
+                    TreeField(str(type_.id), validators, form=form))
diff --git a/openatlas/forms/field.py b/openatlas/forms/field.py
index 979edd82a..92e0f048a 100644
--- a/openatlas/forms/field.py
+++ b/openatlas/forms/field.py
@@ -394,8 +394,10 @@ def __init__(
             type_id: str = '',
             filter_ids: Optional[list[int]] = None,
             is_type_form: Optional[bool] = False,
+            form: Any = None,
             **kwargs: Any) -> None:
         super().__init__(label, validators, **kwargs)
+        self.form = form
         self.type_id = type_id or self.id
         self.filters_ids = filter_ids
         self.is_type_form = is_type_form
diff --git a/openatlas/views/changelog.py b/openatlas/views/changelog.py
index 28b9c9f22..cfb80aa6d 100644
--- a/openatlas/views/changelog.py
+++ b/openatlas/views/changelog.py
@@ -21,6 +21,9 @@ def index_changelog() -> str:
             '2273': 'API: Endpoint to retrieve all available CIDOC properties',
             '2274': 'API: Endpoint to get related entities'
         }}],
+    '8.4.1': ['2024-05-14', {
+        'fix': {
+            '2280': 'Dynamic type add not working for single types'}}],
     '8.4.0': ['2024-05-05', {
         'feature': {
             '2261': 'Option to prevent selection of a type',
diff --git a/openatlas/views/imports.py b/openatlas/views/imports.py
index f08169bb0..450df3ac0 100644
--- a/openatlas/views/imports.py
+++ b/openatlas/views/imports.py
@@ -295,16 +295,16 @@ def import_data(project_id: int, class_: str) -> str:
         if not form.preview.data and checked_data and (
                 not file_data['backup_too_old'] or app.testing):
             Transaction.begin()
-            #try:
-            Import.import_data(project, class_, checked_data)
-            Transaction.commit()
-            g.logger.log('info', 'import', f'import: {len(checked_data)}')
-            flash(f"{_('import of')}: {len(checked_data)}", 'info')
-            imported = True
-            # except Exception as e:  # pragma: no cover
-            #     Transaction.rollback()
-            #     g.logger.log('error', 'import', 'import failed', e)
-            #     flash(_('error transaction'), 'error')
+            try:
+                Import.import_data(project, class_, checked_data)
+                Transaction.commit()
+                g.logger.log('info', 'import', f'import: {len(checked_data)}')
+                flash(f"{_('import of')}: {len(checked_data)}", 'info')
+                imported = True
+            except Exception as e:  # pragma: no cover
+                Transaction.rollback()
+                g.logger.log('error', 'import', 'import failed', e)
+                flash(_('error transaction'), 'error')
     return render_template(
         'import_data.html',
         form=form,