Solution : https://service.sap.com/sap/support/notes/356648 (SAP Service marketplace login required)
Key words : 
additional key words emu, db error ora-1555 specifically, system generates data clusters, sap euro portal, logical error, technical error, system recognizes, system shutdowns, original data, data back-
Related Notes : 
       
| 203500 | Cluster: Conditions for restartability | 
| 183158 | LC changeover to euro: Cluster functions | 
| 132631 | Restart capability of local currency changeover |