Solution : https://service.sap.com/sap/support/notes/1329236 (SAP Service marketplace login required)
Key words : 
terms redefined exception aggregation reason, solution sap netweaver bi 7, 01 bi abap support package 05, refined exception aggregation, sap netweaver bi 7, correct error message, termination getwa_not_assigned occurs, sap nw bi 7, deleted key figure, calculated key figure
Related Notes : 
       
| 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 |