Solution : https://service.sap.com/sap/support/notes/185280 (SAP Service marketplace login required)
Key words : 
31i          sapkh31i5340b          sapkh40b4345b          sapkh45b2446b          sapkh46b0846c          sapkh46c01 additional key words ewuactiv, local currency conversion, sufficient time buffer, support package level, selection option exists, option exists, changeover package, cluster package, cluster procedure, default procedure
Related Notes : 
       
| 371903 | Euro changeover:dump TSV_INDEX_INDEX_NO_ROLL_MEMORY | 
| 183158 | LC changeover to euro: Cluster functions | 
| 121626 | Euro LC changeover:important Support Packages info. |