title: Dynamic data type for a variable
body: <p>Usually, we declare table field as data type like this:</p>
  
  <blockquote>
    <p>DATA key TYPE vbak-vbeln.</p>
  </blockquote>
  
  <p>However, I want to give field names dynamically in the declaration like so:</p>
  
  <blockquote>
    <p>DATA key TYPE vbak-<strong>fieldname</strong>.</p>
  </blockquote>
  
  <p>How might I accomplish this?</p>