Solution : https://service.sap.com/sap/support/notes/1478263 (SAP Service marketplace login required)
Key words : 
prerequisites program error solution program correction, system landscape comprises, short dump 'convt_no_number', error message, dump occurred, big endian, differnt encoding, exception 'cx_sy_conversion_no_number', report rcn_save_variant, terms unicode
Related Notes : 
       
| 1536359 | |
| 1488070 | PSIS: loading variants doesn't read all the filters | 
| 1477302 | |
| 1448532 | PS-IS: Variants lead to terminations after Unicode migration | 
| 1310720 | Collection Note for Unicode Systems with different endianess |