title: Change parameter name on selection screen to a real text
body: <p>I'm trying to replace the parameter name shown on the <a href="https://help.sap.com/doc/abapdocu_753_index_htm/7.53/en-US/index.htm?file=abenselection_screen.htm" rel="nofollow noreferrer">selection screen</a>. </p>
  
  <p>For example I have:</p>
  
  <pre><code>PARAMETERS pa_age TYPE age_type DEFAULT '18'.
  </code></pre>
  
  <p>It shows <code>PA_AGE</code> on the screen. </p>
  
  <p>How to change it to <code>How old are you?</code> for instance?</p>