Solution : https://service.sap.com/sap/support/notes/583039 (SAP Service marketplace login required)
Key words : 
solution call transaction rsmdcnvexit, correct internal values, 0b system directly, symptom characteristic values, correct characteristic values, system status stating, characteristic values, rsmdcnvexit transaction, system status, conversion routines
Related Notes : 
       
| 447341 | values for ALPHA conversion routine |