Solution : https://service.sap.com/sap/support/notes/1364196 (SAP Service marketplace login required)
Key words : 
conversion error duringins database access, error => bcd -> number conversion failed, binary coded decimals reason, 34 2009c   error => invalid sign, error => invalid bcd number, runtime error dbif_rsql_invalid_rsql, invalid bcd numbers, 34 btc 011 000 ddic           bv 5, abap dictionary type, small abap program
Related Notes : 
       
| 339932 | Termination with invalid BCD number in developer trace |