Solution : https://service.sap.com/sap/support/notes/685584 (SAP Service marketplace login required)
Key words : 
sum exception aggregation, -cumulative key figure, exception aggregation, key figure, terms query, av2 reason, -cumulative, prerequisites, correction, insufficient
Related Notes : 
       
| 708439 | Incorrect unit/currency display with AV1 exception aggr. | 
| 647747 | SAPBWNews BW 3.0B Support Package 18 | 
| 601038 | SAPBWNews BW 3.1 Content Support Package 12 |