diff --git a/nova/api/openstack/compute/plugins/v3/server_groups.py b/nova/api/openstack/compute/plugins/v3/server_groups.py
index 50b0c49cef02..1389b05254e2 100644
--- a/nova/api/openstack/compute/plugins/v3/server_groups.py
+++ b/nova/api/openstack/compute/plugins/v3/server_groups.py
@@ -131,6 +131,12 @@ class ServerGroupController(wsgi.Controller):
         """Creates a new server group."""
         context = _authorize_context(req)
 
+        policies = body['server_group']['policies']
+        if ('anti-affinity' in policies and
+            'affinity' in policies):
+            msg = _("Conflicting policies configured!")
+            raise exc.HTTPBadRequest(explanation=msg)
+
         quotas = objects.Quotas()
         try:
             quotas.reserve(context, project_id=context.project_id,
diff --git a/nova/api/openstack/compute/schemas/v3/server_groups.py b/nova/api/openstack/compute/schemas/v3/server_groups.py
index f270ff7f1d8e..56449d2f5393 100644
--- a/nova/api/openstack/compute/schemas/v3/server_groups.py
+++ b/nova/api/openstack/compute/schemas/v3/server_groups.py
@@ -30,13 +30,7 @@ create = {
                 'policies': {
                     'type': 'array',
                     'items': {
-                        'type': 'string', 'enum': SUPPORTED_POLICIES,
-                        'not': {'allOf': [
-                            # NOTE: Clients cannot specify both affinity and
-                            # anti-affinity in a single request.
-                            {'enum': 'affinity'},
-                            {'enum': 'anti-affinity'}
-                        ]}
+                        'type': 'string', 'enum': SUPPORTED_POLICIES
                     },
                     'uniqueItems': True,
                     'minItems': 1
diff --git a/nova/tests/unit/api/openstack/compute/contrib/test_server_groups.py b/nova/tests/unit/api/openstack/compute/contrib/test_server_groups.py
index 45e186c6dad8..6c48e82f2213 100644
--- a/nova/tests/unit/api/openstack/compute/contrib/test_server_groups.py
+++ b/nova/tests/unit/api/openstack/compute/contrib/test_server_groups.py
@@ -208,7 +208,7 @@ class ServerGroupTestV21(test.TestCase):
         sgroup = server_group_template()
         policies = ['anti-affinity', 'affinity']
         sgroup['policies'] = policies
-        self.assertRaises(self.validation_error, self.controller.create,
+        self.assertRaises(webob.exc.HTTPBadRequest, self.controller.create,
                           self.req, body={'server_group': sgroup})
 
     def test_create_server_group_with_duplicate_policies(self):