Solution : https://service.sap.com/sap/support/notes/1016813 (SAP Service marketplace login required)
Key words :
sapbwnews bw sp20 netweaver'04 stack 20, sap netweaver 2004s bi, symptom existing variable values, variable screen form field, prerequisites program error, service market place, html text box, latest patch level, 50 import support package 20, 0 import support package 13
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