Solution : https://service.sap.com/sap/support/notes/1331836 (SAP Service marketplace login required)
Key words : 
2 parent info-objects material, solution sap netweaver bi 7, parent region & country, sap netweaver bi 7, child->father->grandfather, sap nw bi7, info-object state, info-object region, info-object order, child info-object
Related Notes : 
       
| 1594675 | Subsequent correction to note 1331836 | 
| 1270629 | SAPBINews NW7.0 BI ABAP Support Package 21 | 
| 1263691 | SAPBWNews NW BW 7.11 ABAP Support Package 03 | 
| 1260071 | SAPBINews NW 7.10 BI ABAP Support Package 08 | 
| 1227876 | SAPBINews NW7.01 BI ABAP Support Package 04 |