Solution : https://service.sap.com/sap/support/notes/652096 (SAP Service marketplace login required)
Key words : 
parameter dbs/ada/use_hints = abap->1must, maxdb/sapdb-specific rules, maxdb/sapdb dbsl-libs, patch level 1412to ensure, open sql statement, terms open sql, open sql hints, maxdb/sapdb hints, patch level 67set, maxdb/sapdb optimizer
Related Notes : 
       
| 978742 | MaxDB FIRST_ROWS hint for UP TO n ROWS | 
| 832544 | FAQ: MaxDB Hints | 
| 830468 | FAQ: Business Information Warehouse system with SAP MaxDB | 
| 723020 | Database hint SHORT_SUM_VALUES | 
| 129385 | Database hints in Open SQL |