Base_report_creator : Behaves badly for object with _inherits

Hi

In base_report_creator, i create a new report, give it a name and just add object
- product.product
- product.template
- product.category

and click on save, and i see this error

Operating System Locale : fr_FR.UTF8
Python Version : 2.5.2
OpenERP-Client Version : 5.0.7
Last revision No. & ID :Bazaar Package not Found !Traceback (most recent call last):
  File "/home/alncchau/instances/msa/server/bin/netsvc.py", line 244, in dispatch
    result = LocalService(service_name)(method, *params)
  File "/home/alncchau/instances/msa/server/bin/netsvc.py", line 73, in __call__
    return getattr(self, method)(*params)
  File "/home/alncchau/instances/msa/server/bin/service/web_services.py", line 583, in execute
    res = service.execute(db, uid, object, method, *args)
  File "/home/alncchau/instances/msa/server/bin/osv/osv.py", line 59, in wrapper
    return f(self, dbname, *args, **kwargs)
  File "/home/alncchau/instances/msa/server/bin/osv/osv.py", line 118, in execute
    res = pool.execute_cr(cr, uid, obj, method, *args, **kw)
  File "/home/alncchau/instances/msa/server/bin/osv/osv.py", line 110, in execute_cr
    return getattr(object, method)(cr, uid, *args, **kw)
  File "/home/alncchau/instances/msa/server/bin/osv/orm.py", line 2605, in write
    self.pool.get(object)._store_set_values(cr, user, ids, fields, context)
  File "/home/alncchau/instances/msa/server/bin/osv/orm.py", line 2832, in _store_set_values
    result = self._columns[f].get(cr, self, ids, f, uid, context=context)
  File "/home/alncchau/instances/msa/server/bin/osv/fields.py", line 646, in get
    res = self._fnct(obj, cr, user, ids, name, self._arg, context)
  File "/home/alncchau/instances/msa/addons/base_report_creator/base_report_creator.py", line 283, in _sql_query_get
    models = self._path_get(cr, uid, obj.model_ids, obj.filter_ids)
  File "/home/alncchau/instances/msa/addons/base_report_creator/base_report_creator.py", line 214, in _path_get
    and not (isinstance(model_pool._columns[x[0]],fields.function) or isinstance(model_pool._columns[x[0]],fields.related)), fields_get.items()))
  File "/home/alncchau/instances/msa/addons/base_report_creator/base_report_creator.py", line 214, in <lambda>
    and not (isinstance(model_pool._columns[x[0]],fields.function) or isinstance(model_pool._columns[x[0]],fields.related)), fields_get.items()))
KeyError: 'categ_id'

Regards,