Solution : https://service.sap.com/sap/support/notes/357016 (SAP Service marketplace login required)
Key words : 
additional key words parallel hint, parallel hint give, cost based optimizer, cost-based optimizer, parallel hint, select / + parallel /, incorrect number, resulting quantity, optimizer_mode = choose, previous recommendation
Related Notes : 
       
| 658322 | Composite SAP Note: Incorrect resulting set with Oracle | 
| 180605 | Oracle database parameter settings for BW |