diff -r 058bb3dc685f -r 0b59724cb3f2 cubicweb/server/test/data-cwep002/schema.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cubicweb/server/test/data-cwep002/schema.py	Sat Jan 16 13:48:51 2016 +0100
@@ -0,0 +1,35 @@
+# copyright 2014 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of CubicWeb.
+#
+# CubicWeb is free software: you can redistribute it and/or modify it under the
+# terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 2.1 of the License, or (at your option)
+# any later version.
+#
+# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
+
+from yams.buildobjs import EntityType, RelationDefinition, Int, ComputedRelation
+
+class Person(EntityType):
+    salary = Int()
+
+class works_for(RelationDefinition):
+    subject = 'Person'
+    object  = 'Company'
+    cardinality = '?*'
+
+class Company(EntityType):
+    total_salary = Int(formula='Any SUM(SA) GROUPBY X WHERE '
+                       'P works_for X, P salary SA')
+
+class has_employee(ComputedRelation):
+    rule = 'O works_for S'
+    __permissions__ = {'read': ('managers',)}