I'm getting this error while trying to update the crm module : 

File "/opt/openerp/server/openerp/addons/base/ir/ir_model.py", line 869, in _get_id raise ValueError('No such external ID currently defined in the system: %s.%s' % (module, xml_id)) ValueError: No such external ID currently defined in the system: crm.

He can't find the id of the module to update it, and the crm module exist and installed, how can we explain that ?