fixed issue #2032, thanks Paolo

gluon/dal/objects.py

@@ -428,7 +428,10 @@ class Table(object):
                             if tn == name or getattr(db[tn],'_ot',None)==name])
             query = self._common_filter
             if query:            
+                self._common_filter = \
+                    lambda q: reduce(AND, [query(q), newquery(q)])
                 newquery = query & newquery
+            else:
                 self._common_filter = newquery
 
     def _validate(self, **vars):