Solution : https://service.sap.com/sap/support/notes/1119859 (SAP Service marketplace login required)
Key words : 
bw-bex environment, ora-00600 argument occurs, internal error code, parallel query reason, parallel query option, related trace file, []current sql statement, affected statement, related index, /bic/yunit
Related Notes : 
       
| 985118 | Wrong Values with parallel execution |