To modify the lines that are selected, the values of the changing parameter
CT_SELECTED_LINES of IF_FPM_GUIBB_LIST~GET_DATA( ) has to be adapted. In addition, the exporting parameter EV_SELECTED_LINES_CHANGED has to be set to ABAP_TRUE.
To modify the line related to the lead selection index, the values of the changing
parameter CV_LEAD_INDEX of IF_FPM_GUIBB_LIST~GET_DATA( ) has to be adapted.