Manipulate Layout on ALV Grid with dynamic table

Question

Dear all
i'm generating a dynamic table depending of a date selection. That means that I show columns for weeks and the quantity of weeky migh change.
Now the users wants to have a specific layout of the ALV grid with totals. When he saves the layout, only the weeks at this selection will show the next time he runs the programm with a larger selection.
a) Is it possible to modify the layout during runtime by programming?
b) Do you have any other ideas how to solve this problem?
Thank you

Answer 1

You don't know the names of your columns? hmm you do, because before you created dynamic table you had to create field catalog, so the structure and column names of newly (dynamically) created table will be the same like defined in the field catalog.
The last loop also does not look good, in my opinion should be something like:
LOOP AT lt_datatable +(my first table)+ ASSIGNING <ls_data4>.
    AT NEW pernr.
      APPEND initial line to <fs_1> assigning <fs_2>.
      <fs_2>-pernr = <ls_data4>-pernr.
    ENDAT.
    ASSIGN COMPONENT <ls_data4>-wage_type OF STRUCTURE <fs_2> TO <fs_5>.
    <fs_5> = <ls_data4>-amount.
ENDLOOP.
also keep in mind that number of calls of method cl_alv_table_create=>create_dynamic_table is limited to 36 (?) calls within one program session because it uses dynamic subroutine pool behind so you will have short dump if you will execute that 37 times.