Get value field dynamically from another table ABAP

Question

help me for report Abap. I have 2 table.

1. Itab head

Z1	Z2	Z3
A	B	C

2. Itab obbligatory field

Fieldname
Z2

i should create a file with only fields of itab2(itab obbligatory field) but the value of itab head.

The file will be:

tab file

Z2
B

Itab2 say me which field of itab1 are obbligatory for create itab file.

Answer 1

This gives you an idea of what to do using ASSIGN for dynamic field selection.

  LOOP AT itab_a INTO DATA(wa_itab_a).     " your data tab
    LOOP AT itab_b INTO DATA(wa_itab_b).   " your obligatory field list
      TRANSLATE wa_itab_b-fieldname TO UPPER CASE. " important if they are not already in uppercase
      ASSIGN COMPONENT wa_itab_b-fieldname OF STRUCTURE wa_itab_a TO FIELD-SYMBOL(<fs_field>).
      " ... in <FS_FIELD> you will have the values of the obligatory fields
      " so you can concatenate, par example, to file line
      CONCATENATE wa_file-line <fs_field> INTO wa_file-line SEPARATED BY c_separator.
    ENDLOOP.
    " append file line here, something like this:
    APPEND wa_file TO itab_file.
    CLEAR wa_file.
  ENDLOOP.