Solution : https://service.sap.com/sap/support/notes/139301 (SAP Service marketplace login required)
Key words : 
attached analysis report ztfchck, additional key words euro, attached analysis program ztfchck, exchange rate tables tcurf, unrealistic exchange rate values, table fields ekko-wkurs, unrealistic exchange rates, exchange rate ratio, exchange rate field, 0f euro_cnv add-
Related Notes : 
       
| 144866 | |
| 139266 | Euro chgover incor. historical exchg rates created | 
| 136071 | Euro LC chngeover:Exch. rates translated incorrctly | 
| 121626 | Euro LC changeover:important Support Packages info. |