Solution : https://service.sap.com/sap/support/notes/1339510 (SAP Service marketplace login required)
Key words :
terms web dynpro abap alv null_as_ reason, 00import basis support package 20, 01import basis support package 5, 02import basis support package 1, 10import basis support package 9, 11import basis support package 3, sap netweaver support package, wd abap alv, method if_salv_wd_comp_table_data~node_data_techinfo, solution sap netweaver 7
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