We had complex routes with  locations

Route P1111
Configuration of location
A -> B
B -> C 
C -> B
B -> A
A -> D
D -> E
E -> F

This generate bugs 

    self[a[0]] = a[1]
  File "/opt/saas/openerp/tools/func.py", line 62, in wrapper
    lock.release()
  File "/usr/lib/python2.7/threading.py", line 213, in release
    self._note("%s.release(): non-final release", self)
RuntimeError: maximum recursion depth exceeded