diff --git a/ereuse_devicehub/inventory/forms.py b/ereuse_devicehub/inventory/forms.py
index 641d4b84..1dc9cff2 100644
--- a/ereuse_devicehub/inventory/forms.py
+++ b/ereuse_devicehub/inventory/forms.py
@@ -1247,10 +1247,13 @@ class TradeDocumentForm(FlaskForm):
         super().__init__(*args, **kwargs)
         self._lot = Lot.query.filter(Lot.id == lot_id).one()
 
+        if not self._lot.transfer:
+            self.form_errors = ['Error, this lot is not a transfer lot.']
+
     def validate(self, extra_validators=None):
         is_valid = super().validate(extra_validators)
 
-        if g.user not in [self._lot.trade.user_from, self._lot.trade.user_to]:
+        if g.user not in [self._lot.transfer.user_from, self._lot.transfer.user_to]:
             is_valid = False
 
         return is_valid
@@ -1268,7 +1271,7 @@ class TradeDocumentForm(FlaskForm):
         self._obj.file_name = file_name
         self._obj.file_hash = file_hash
         db.session.add(self._obj)
-        self._lot.trade.documents.add(self._obj)
+        self._lot.documents.add(self._obj)
         if commit:
             db.session.commit()
 
diff --git a/ereuse_devicehub/inventory/views.py b/ereuse_devicehub/inventory/views.py
index 8f374a95..47681ff5 100644
--- a/ereuse_devicehub/inventory/views.py
+++ b/ereuse_devicehub/inventory/views.py
@@ -724,7 +724,7 @@ class NewTradeView(DeviceListMixin, NewActionView):
         return flask.redirect(next_url)
 
 
-class NewTradeDocumentView(View):
+class NewTradeDocumentView(GenericMixin):
     methods = ['POST', 'GET']
     decorators = [login_required]
     template_name = 'inventory/trade_document.html'
diff --git a/ereuse_devicehub/templates/inventory/device_list.html b/ereuse_devicehub/templates/inventory/device_list.html
index 57f42a55..21694dfc 100644
--- a/ereuse_devicehub/templates/inventory/device_list.html
+++ b/ereuse_devicehub/templates/inventory/device_list.html
@@ -462,10 +462,24 @@
                     </tr>
                   </thead>
                   <tbody>
+                    {% for doc in lot.documents %}
+                    <tr>
+                      <td>
+                        {% if doc.url.to_text() %}
+                          <a href="{{ doc.url.to_text() }}" target="_blank">{{ doc.file_name}}</a>
+                        {% else %}
+                          {{ doc.file_name}}
+                        {% endif %}
+                      </td>
+                      <td>
+                          {{ doc.created.strftime('%H:%M %d-%m-%Y')}}
+                      </td>
+                    </tr>
+                    {% endfor %}
                     {% for doc in lot.trade.documents %}
                     <tr>
                       <td>
-                        {% if doc.url %}
+                        {% if doc.url.to_text() %}
                           <a href="{{ doc.url.to_text() }}" target="_blank">{{ doc.file_name}}</a>
                         {% else %}
                           {{ doc.file_name}}
diff --git a/tests/test_render_2_0.py b/tests/test_render_2_0.py
index 0ff63885..0ffb4f91 100644
--- a/tests/test_render_2_0.py
+++ b/tests/test_render_2_0.py
@@ -184,7 +184,6 @@ def test_upload_snapshot(user3: UserClientFlask):
 @pytest.mark.mvp
 @pytest.mark.usefixtures(conftest.app_context.__name__)
 def test_upload_snapshot_to_lot(user3: UserClientFlask):
-    # TODO
     user3.get('/inventory/lot/add/')
     lot_name = 'lot1'
     data = {
@@ -2406,3 +2405,55 @@ def test_bug_3821_binding(user3: UserClientFlask):
     body, status = user3.get(uri)
     assert status == '200 OK'
     assert 'is not a Snapshot device!' in body
+
+
+@pytest.mark.mvp
+@pytest.mark.usefixtures(conftest.app_context.__name__)
+def test_bug_3831_documents(user3: UserClientFlask):
+    uri = '/inventory/lot/add/'
+    user3.get(uri)
+    lot_name = 'lot1'
+    data = {
+        'name': lot_name,
+        'csrf_token': generate_csrf(),
+    }
+    user3.post(uri, data=data)
+    lot = Lot.query.filter_by(name=lot_name).one()
+
+    lot_id = lot.id
+    uri = f'/inventory/lot/{lot_id}/trade-document/add/'
+    body, status = user3.get(uri)
+    txt = 'Error, this lot is not a transfer lot.'
+
+    assert status == '200 OK'
+    assert txt in body
+
+    uri = f'/inventory/lot/{lot_id}/transfer/incoming/'
+    user3.get(uri)
+    data = {'csrf_token': generate_csrf(), 'code': 'AAA'}
+
+    body, status = user3.post(uri, data=data)
+    assert status == '200 OK'
+    assert 'Transfer created successfully!' in body
+    assert 'Delete Lot' in body
+    assert 'Incoming Lot' in body
+
+    uri = f'/inventory/lot/{lot_id}/trade-document/add/'
+    body, status = user3.get(uri)
+
+    b_file = b'1234567890'
+    file_name = "my_file.doc"
+    file_upload = (BytesIO(b_file), file_name)
+
+    data = {
+        'csrf_token': generate_csrf(),
+        'url': "",
+        'description': "",
+        'document_id': "",
+        'date': "",
+        'file': file_upload,
+    }
+
+    uri = f'/inventory/lot/{lot_id}/trade-document/add/'
+    # body, status = user3.post(uri, data=data, content_type="multipart/form-data")
+    # assert status == '200 OK'