Solution : https://service.sap.com/sap/support/notes/996812 (SAP Service marketplace login required)
Key words :
sapbwnews bw support package 20 netweaver'04 stack 20, getwa_not_assigned runtime error occurs, sap bw releases 3, field symbol <l_text>, additional support packages, 50 import support package 20, 0 import support package 11, attached correction instructions, sapbwnews bw 7, support package
Related Notes :
986891 | SAPBWNews BW Support Package 20 NetWeaver '04 Stack 20 RIN |
914305 | SAPBINews NetWeaver 7.0 BI Support Package 11 |