field symbols – SAP EWM Help https://www.sapewmhelp.com SAP EWM questions answered by experts — ABAP, S/4HANA, warehouse management Tue, 05 Aug 2025 18:38:58 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.4 How to use FIELD-SYMBOLS for dynamic access to internal tables in ABAP? https://www.sapewmhelp.com/question/how-to-use-field-symbols-for-dynamic-access-to-internal-tables-in-abap/ https://www.sapewmhelp.com/question/how-to-use-field-symbols-for-dynamic-access-to-internal-tables-in-abap/#respond Tue, 05 Aug 2025 18:38:58 +0000 https://www.sapewmhelp.com/?question=how-to-use-field-symbols-for-dynamic-access-to-internal-tables-in-abap FIELD-SYMBOLS are like pointers in other programming languages. They don’t store data themselves but rather point to memory locations dynamically. This is especially useful when you don’t know the field or structure you’re working with until runtime.

Step 1: Declare an internal table and fill it

REPORT zclass_test_dp.
TYPES: BEGIN OF ty_employee,
         emp_id   TYPE i,
         emp_name TYPE string,
       END OF ty_employee.

DATA: it_employees TYPE STANDARD TABLE OF ty_employee,
      wa_employee  TYPE ty_employee.

wa_employee-emp_id = 101.
wa_employee-emp_name = 'John'.
APPEND wa_employee TO it_employees.

wa_employee-emp_id = 102.
wa_employee-emp_name = 'Alice'.
APPEND wa_employee TO it_employees.


field-symbols: <fs_line> type ty_employee,
              <fs_field> type any.

LOOP AT it_employees ASSIGNING <fs_line>.

  ASSIGN COMPONENT 'EMP_NAME' OF STRUCTURE <fs_line> TO <fs_field>.

  IF sy-subrc = 0.
    WRITE: / 'Employee Name:', <fs_field>.
  ENDIF.

ENDLOOP.

Output:

What’s Happening Here?

  • ASSIGNING <fs_line> lets us avoid copying the whole structure — we just point to it.
  • ASSIGN COMPONENT allows dynamic accessing a specific field by name, like ‘EMP_NAME’.
  • <fs_field> can now be used to read or modify that field.

Summary

Concept Description
FIELD -SYMBOLS Pointer-like dynamic variable in ABAP
ASSIGN Used to assign memory reference
ASSIGN COMPONENT Access structure fields by name at runtime
ANY Type Use for unknown/dynamic field types

Used heavily in:

  • Dynamic ALV reporting
  • Generic data processing
  • Dynamic field mapping
  • Frameworks like BOPF or RAP where field names are metadata-driven
]]> https://www.sapewmhelp.com/question/how-to-use-field-symbols-for-dynamic-access-to-internal-tables-in-abap/feed/ 0