Exception raise when groupby partner in internal move

[tfr (Openerp)]

How to reproduce :
last revision of trunk for addons, server, gtk client and web client
-Use the demo db
-Warehouse >> Warehouse management >> incoming shippement
View list push on group by partner

get this exception

Traceback (most recent call last):
  File "/home/openerp/trunk/server/bin/netsvc.py", line 489, in dispatch
    result = ExportService.getService(service_name).dispatch(method, auth, params)
  File "/home/openerp/trunk/server/bin/service/web_services.py", line 586, in dispatch
    res = fn(db, uid, *params)
  File "/home/openerp/trunk/server/bin/osv/osv.py", line 57, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/openerp/trunk/server/bin/osv/osv.py", line 140, in execute
    res = pool.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/openerp/trunk/server/bin/osv/osv.py", line 130, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/openerp/trunk/server/bin/osv/orm.py", line 2241, in read_group
    assert not groupby or groupby in fields, "Fields in 'groupby' must appear in the list of fields to read (perhaps it's missing in the list view?)"
AssertionError: Fields in 'groupby' must appear in the list of fields to read (perhaps it's missing in the list view?)