Solution : https://service.sap.com/sap/support/notes/445017 (SAP Service marketplace login required)
Key words : 
additional key words rrsv 005, alpha conversion forconsolidation units, global system settings, conversion exits bfimc, correct internal format, consolidation unit/group, internal format, consolidation units, alpha conversion, system displays
Related Notes : 
       
| 447341 | values for ALPHA conversion routine |