diff --git a/bin/osv/orm.py b/bin/osv/orm.py
index a639a775b01..e64f59f626b 100644
--- a/bin/osv/orm.py
+++ b/bin/osv/orm.py
@@ -3201,9 +3201,11 @@ class orm(orm_template):
                     ids_to_check.extend([id, update_date])
             if not ids_to_check:
                 continue
-            cr.execute("SELECT 1 FROM %s WHERE %s" % (self._table, " OR ".join([check_clause]*(len(ids_to_check)/2))), tuple(ids_to_check))
-            if cr.fetchone():
-                raise except_orm('ConcurrencyException', _('Records were modified in the meanwhile'))
+            cr.execute("SELECT id FROM %s WHERE %s" % (self._table, " OR ".join([check_clause]*(len(ids_to_check)/2))), tuple(ids_to_check))
+            res = cr.fetchone()
+            if res:
+                # mention the first one only to keep the error message readable
+                raise except_orm('ConcurrencyException', _('A document was modified since you last viewed it (%s:%d)') % (self._description, res[0]))
 
     def check_access_rule(self, cr, uid, ids, operation, context=None):
         """Verifies that the operation given by ``operation`` is allowed for the user