Solution : https://service.sap.com/sap/support/notes/1444793 (SAP Service marketplace login required)
Key words :
runtime errors compute_bcd_overflowexception cx_sy_arithmetic_overflowsource program rdsvasaew_status___________070source code, dialog users executing online transactions, web based work process steps, apply st-ser 701_2010, final manual correction attached, st-ser release 701_2008_2, implement code modifications, work process steps, abap code logic, dialog task type