title: How to get protected attribute of class in another class
body: <p>I need to get protected attribute <code>attr_1</code> of class <code>Class_1</code> in my own <code>Z-class</code> and use it as an input parameter for my method <code>GET_CAMP_DATA()</code>.</p>
  
  <p>Can anybody help me to solve my problem?</p>
  
  <p>I want to do something like this:</p>
  
  <pre><code>DATA(lv_camp_id) = Class_1=&gt;attr_1`.
  
  CALL METHOD GET_CAMP_DATA
  EXPORTING
    iv_camp_id            = lv_camp_id
  IMPORTING
    et_result             = lt_result
  </code></pre>