Solution : https://service.sap.com/sap/support/notes/396304 (SAP Service marketplace login required)
Key words : 
txt_n_missing additional key words olap, business information warehouse, expand hierarchy, system generates, error message, system error, form fill_axis_setxx_line, program error, solution bw2, 0b            import
Related Notes : 
       
| 382565 | SAPBWNews BW 2.1C Support Package 06 | 
| 374840 | SAPBWNews BW 2.0B Support Package 14 |