The question should be "What was WITH HEADER LINE used for in ABAP". You should see them only in legacy code. They are allowed only outside classes and are obsolete anyway. Answering your question. It is both. It declares an internal table customer_tab[] and a structure customer_tab. You could then do such "amazing" things like.

In the early days of ABAP development there was a slightly different concept to declaring a multi line table and its single lined header / work area. Basically when you create a table using this old method a header line is automatically created with the same name and depending on how you referenced it, and the statement used would determine the appropriate element to be accessed.

These statements automatically assume the header line as an implicit work area.=20. for example. Operations without header line. INSERT INTO TABLE .

Abap itab with header line

It depends on how the internal table is declared that the itab will have the header line or not. e.g. data: begin of itab occurs 10, ab type c, cd type i, end of itab. " this table will have the header line. data: wa_itab like itab.

Tables with header lines are an older concept and should not be used in new development. Internal Table: Standard Table with / without header line. This code

Otherwise, ABAP interprets the name as the name of the header line and not of the body of the table. You can avoid this potential confusion by using internal tables without 2008-07-23 · Using header line can cause ambiguity in code, for example CLEAR t_itab2 means that you cleared entire contents of table t_itab2, whilst the statement CLEAR t_itab1 will only clear the contents of t_itab1 header. To clear the entire contents of internal table with header line, use brackets after variable statement, ex: CLEAR t_itab1[].

7 Jul 2011 You can use the header line as a work area when you process the internal table. The ABAP statements that you use with internal tables have

CLEAR itab[].

ENDLOOP. This example creates two internal tables of the same type, ITAB and JTAB, both with a header line.
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코딩시 주로 사용되는 명령어를 정리해 보았습니다 명령어 Sample code 설명 CLEAR itab. CLEAR itab. (with header line)CLEAR itab[].

WA_ITAB-ZEMPNO = ‘110’. WA_ITAB-ZEMPNAME = ‘EXTERNAL’. data itab tytp table of char10 with header line. 用了该语法以后，itab即是一个内表，又是一个与该内表结构相同的工作区因为itab同时是工作区，又是内表，很容易混淆，所以在现在程序开发中不建议使用，一般都需要另建工作区，来操作内表， Die verschiedenen Arten um eine interne Tabelle zu deklarieren: * * Coded by Thorsten Neubüser - www.4ap.de * * kurz und knackig z.B.
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2008-01-30 · data type standard table of with non-unique default key initial size with header line. In the original statement, no independent data type is created. Instead, the line type only exists as an attribute of the data object .

für Fubaus data: TI_BAPICONDCT TYPE TABLE OF BAPICONDCT WITH HEADER LINE. * die alte, klassische Methode DATA: BEGIN OF OCCURS , matnr like mara-matnr, werks like marc-werks, END OF , * zweite Itab itab2 like line of itab1 OCCURS 0 with abap에서 with header line이란 첫 번째 선언문은 'with header line'을 명시하지 않지만 6 동적 키 지정으로 itab 읽기; 1 abap : MODIFY is the statement to change single or multiple lines in an internal table.Use the INDEX addition to change a single line. If we use the INDEX addition and the operation is successful, SY-SUBRC will be set to zero and the contents of the work area overwrites the contents of the line with the corresponding index.

With ABAP 740 release you can use the function LINE_EXISTS to check if record exist in ITAB or not without need for catching the exceptions

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Try to modify your program using a field symbol: DATA: IT_BSEG TYPE TABLE IT_VBSEG. FIELD-SYMBOLS: like line of IT_BSEG.