Solution : https://service.sap.com/sap/support/notes/137657 (SAP Service marketplace login required)
Key words : 
menu option extras ---> force conversion, menu option utilities ---> database utility3, dynpro_field_conversion additional key words, symptom short dump, call transaction se11, solution table sdbaadaupd, database table, table sdbaadaupd, transaction db12, sdbaadaupd          ----> display2
Related Notes : 
       
| 313089 | |
| 170297 | SAP DB release upgrade to 6.2 |