The effect on the content of field symbols is the same as work areas.

For internal tables we also have the option to use the CLEAR command and 2 options more: REFRESH and FREE. Let's show how they work with an example:

TYPES: BEGIN OF ty_data,
  matnr TYPE matnr,
  value(5) TYPE n,
  erdat TYPE erdat,
END OF ty_data.

DATA: it_data TYPE STANDARD TABLE OF ty_data,
wa_data LIKE LINE OF it_data,
lv_count type i.

DO 10 TIMES.
  wa_data-matnr = sy-index.
  wa_data-value = '01'.
  wa_data-erdat = sy-datum.
  APPEND wa_data TO it_data.
ENDDO.

DESCRIBE TABLE it_data LINES lv_count. " Variable lv_count has the value 10

CLEAR it_data[]. " This will initialize all the content of table including the table header
REFRESH it_data. " This will initialize all the content of table but not the table header
FREE it_data. " This will initialize all the content of table including the table header and will release from memory the table 
 
 
 
Serkan AKKAVAK
Computer Engineer
ABAP Developer & SAP S/4 HANA Logistics Team Lead
Contact : serkurumsal@yandex.com