Solution : https://service.sap.com/sap/support/notes/80898 (SAP Service marketplace login required)
Key words : 
user-defined data type solution, apply hot package sapkh31g11, udefsgenerates incorrect results, additional key words, identical classification, prerequisites check, advance corrections, conjunction
Related Notes : 
       
| 84955 | 4.5A: No values set for UDEF characteristics | 
| 78308 | Classification during value comparison |