title: How to show possible values of a screen field
body: <p>In standard program screen, for some fields there is a button beside which you can click and search allowed values.</p>
  
  <p>Example (program DEMO_DYNPRO_F4_HELP_DICTIONARY):</p>
  
  <p><a href="https://i.stack.imgur.com/px7YL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/px7YL.png" alt="input field with its F4 help button"></a></p>
  
  <p><a href="https://i.stack.imgur.com/WBqMW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WBqMW.png" alt="possible values after invoking F4 help"></a></p>
  
  <p>Can I do the same with ABAP, is it an additional feature of select-options or others?</p>