Solution : https://service.sap.com/sap/support/notes/1448532 (SAP Service marketplace login required)
Summary :  Key words :  Related Notes : 
      After converting to Unicode, runtime error CONVT_NO_NUMBER, resulting from the misassignment of variables during variant data retrieval in transactions (CN
software component   sap_appl                      sap application, manual pre-implementation step manually, konvertiere variante nach unicode, manual pre-implement, executable program application, classic overview transactions, runtime error convt_no_number, exception cx_sy_conversion_no_number occur, logistic information system, projekt info system
       
        
 
        
            1536359 1478263 PSIS: dumps loading variants; servers w/ little & big endian 1319517 Unicode Collection Note 1310720 Collection Note for Unicode Systems with different endianess