How to find internal table fields from which table.

Question

Hello Experts,
I have to use a dynamic select inner join query.
SELECT (lv_string)
  FROM (from_tab)
  INTO CORRESPONDING FIELDS OF TABLE <fs_itab1>
  WHERE (where_tab).
ELSEIF table_1 NE ''.
  SELECT *
  FROM (table_1)
  INTO CORRESPONDING FIELDS OF TABLE <fs_itab1>
  WHERE (where_tab).
in that LV_string is dynamicaly select. from a structure which is a combination of say  VBAK and VBAP
i have to
CONCATENATE 'VBAK~' wa_fields-fname INTO str_temp.
CONCATENATE lv_string str_temp INTO lv_string SEPARATED BY space
CONCATENATE 'VBAP~' wa_fields-fname INTO str_temp.
  CONCATENATE lv_string str_temp INTO lv_string SEPARATED BY space.
with there identifire....how to find that...
Regards,
Ketan.

Answer 1

Ketan,
I believe you CAN find this only when you are creating lv_string from your structure (or whatever it is).
So paste that code that what is your 'structure' type and on what conditions you want to Fill lv_string from it.
in that LV_string is dynamicaly select. from a structure which is a combination of say VBAK and VBAP
If you have a custom or standard Structure from which you need to fill lv_string, then you should have no worries to full VBAK~ or VBAP~ because fieldnames will be always unique in any Structure and hence ~ additions are not necessarily needed.
The issue can be in the case where you are picking few fields each from std tables VBAK and VBAP in your lv_string and
your "(from_tab)" is an inner join condition. I believe in that case you should be able to identify VBAK~ and VBAP~ while populating lv_string itself. Also you can use DB view MASSVBAP.
Regards,
Diwakar