title: What is WITH HEADER LINE used for in ABAP?
body: <p>I have been studying this <a href="https://rads.stackoverflow.com/amzn/click/com/1430248033" rel="nofollow noreferrer" rel="nofollow noreferrer">book</a> and quoting from it:</p>
  
  <pre><code>DATA: BEGIN OF CUSTOMER_TAB OCCURS 5,
           KUNNR TYPE KNA1-KUNNR,
           NAME1 TYPE KNA1-NAME1,
        END OF CUSTOMER_TAB.
  
  This declaration creates an internal table and a structure using the same name: CUSTOMER_TAB.
  </code></pre>
  
  <p>And then in the following pages:</p>
  
  <pre><code>Declaring Both an Internal Table and a Structure by Referring to a Structured 
  Local/Global TYPE or Local/Global Structure
  
  DATA &lt;internal table name&gt; {TYPE|LIKE} &lt;structure name&gt; OCCURS &lt;number&gt; WITH HEADER LINE.
  
  WITH HEADER LINE is a reserved key phrase. The addition of this phrase creates a structure.
  </code></pre>
  
  <p>I am confused at this moment. Is the first example declaring only an Internal Table or an Internal Table and a Structure with the same name?</p>