diff --git a/ereuse_devicehub/inventory/views.py b/ereuse_devicehub/inventory/views.py
index e6110f97..2f47ff92 100644
--- a/ereuse_devicehub/inventory/views.py
+++ b/ereuse_devicehub/inventory/views.py
@@ -354,6 +354,9 @@ class NewAllocateView(NewActionView, DeviceListMix):
             return flask.redirect(next_url)
 
         messages.error('Action {} error!'.format(self.form.type.data))
+        for k, v in self.form.errors.items():
+            value = ';'.join(v)
+            messages.error('Action Error {key}: {value}!'.format(key=k, value=value))
         next_url = self.get_next_url()
         return flask.redirect(next_url)
 
diff --git a/tests/test_render_2_0.py b/tests/test_render_2_0.py
index 16c950bf..0df56652 100644
--- a/tests/test_render_2_0.py
+++ b/tests/test_render_2_0.py
@@ -668,6 +668,7 @@ def test_action_allocate_error_required(user3: UserClientFlask):
     body, status = user3.post(uri, data=data)
     assert status == '200 OK'
     assert 'Action Allocate error' in body
+    assert 'You need to specify a number of users!' in body
 
 
 @pytest.mark.mvp
@@ -692,6 +693,7 @@ def test_action_allocate_error_dates(user3: UserClientFlask):
     body, status = user3.post(uri, data=data)
     assert status == '200 OK'
     assert 'Action Allocate error' in body
+    assert 'The action cannot finish before it starts.' in body
     assert dev.actions[-1].type != 'Allocate'