An osv_memory object need not be created, but just reference an arbitrary id. Let the page have some modifications, and then search its history for bzr revid: hmo@tinyerp.com-20100901115823-agwkfnmu04yo67nn
bzr revid: hmo@tinyerp.com-20100712063951-2jxybuidx49jw7o4
bzr revid: ksa@tinyerp.co.in-20100412124147-kejx3dff80fxfjt8