Solution : https://service.sap.com/sap/support/notes/581802 (SAP Service marketplace login required)
Key words : 
purely virtual characteristics      l_f4_mode = rsdm_c_f4_dim, l_s_sfc-user_exit = rrke_c_mode-no_selection, read table g_sx_report-sfc, call function 'rsd_cha_help_values_shlp'        exporting, process f4 popup variable, table key chanm = i_chanm, variable dialog box, f4 mode reason, f4 mode called, adjust f4 mode
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