title: Correct way of using TYPE REF TO data?
body: <p>I've declared a type with the type of ref to data. so it looks like this</p>
  
  <pre><code>my_type type ref to data.
  </code></pre>
  
  <p>Then I declare an internal table, which I want to assign to my_type.</p>
  
  <pre><code>Data:
    ref_data type my_type.
    itable type it_table.
  
  ref_data = itable.
  </code></pre>
  
  <p>Why can't I assign itable to ref_data, isn't a ref to data is a generic data type and can be assigned to anything?</p>