Solution : https://service.sap.com/sap/support/notes/686504 (SAP Service marketplace login required)
Key words : 
web api command set_nav_state, 0b            import support package 18, 1c            import support package 12, longer executed correctly, terms query reason, 0b support package 18, 1 content support package  12, bw support packages, support package, 0b patch 18
Related Notes : 
       
| 686601 | |
| 647747 | SAPBWNews BW 3.0B Support Package 18 | 
| 601038 | SAPBWNews BW 3.1 Content Support Package 12 |