What do you mean by “Send To Vienna Codification” trademark status

Viennna code are assigned to figurative element in trademark application according to the Vienna Agreement as per the link below:
http://www.wipo.int/classifications/nivilo/vienna/index.htm#
Vienna codification is done so that trademark searches can be conducted for artwork/logo. Therefore when trademark application is under process of assigning of Vienna Codification the status of trademark registry shows “Send To Vienna Codification”