ALV Report: Summation button issue.

Question

Hi Experts,
I have designed the ALV report. And the requirement is to have a summation button on the o/p screen.
I have tried with :
fieldcatalog-do_sum      = 'X'.
  fieldcatalog-datatype = 'QUAN'.
fieldcatalog-do_sum      = 'X'.
  fieldcatalog-inttype = 'P'.
Sometimes its directly summing the field, which I don't need.
I want to sum only If I click on Summation button.
My fieldcatalog is:
fieldcatalog-tabname     = 'IG_FINAL'.
  fieldcatalog-fieldname   = 'ZPROD1'.
  fieldcatalog-seltext_m   =  text-018.
  fieldcatalog-outputlen   = 25.
  fieldcatalog-emphasize   = 'X'.
  fieldcatalog-do_sum      = 'X'.
  fieldcatalog-datatype = 'QUAN'.
  APPEND fieldcatalog TO fieldcatalog.
  CLEAR  fieldcatalog.
Now what should I do get the summation button working ?
Pls help !

Answer 1

Hi Harish,
almost all run time errors in programs with ALV are related to field catalog errors. Functional errors and questions for ALV are relatedto field catalog not much less.
The only ALV released for customer use is the ALV object model involving classes CL_SALV_*, mainly ans atrting fromCL_SALV_TABLE.
The ALV object model does not use any user-created field catalog.
If you do not take the initial load of reading a few blogs explaining  ALV object model and the time to get used to it, you will remain at the field catalog level for ever.
lr_aggregations    = lio_salv->get_aggregations( ).
    lv_columnname = io_column->get_columnname( ).
    TRY.
        lr_aggregations->add_aggregation(
          columnname  = lv_columnname
          aggregation = if_salv_c_aggregation=>total ).
      CATCH cx_salv_data_error .
        ASSERT 1 = 2.
      CATCH cx_salv_not_found .
        ASSERT 1 = 2.
      CATCH cx_salv_existing .
        ASSERT 1 = 2.
    ENDTRY.
This code snippet may look strange to you - not after you started with CL_SALV_TABLE. Search for Rich Heilmans aticles to start with.
Regards
Clemens