I've written programs which either use OOALV or the standards 'Resue_alv_*' function to display the grid. I've also make use of the parameter IS_SORT to specify some sorting conditions. It is said that by default, if I sort the ALV grid, the dupicate fields will be vertically merged.
However, in my programs the duplicated fields are not merged. I wonder what I've missed and would like to seek for some advise from you guys.