title: SCL code: tag FUNCTION not defined on TIA
body: <p>I want to create a new SCL function with TIA 15.1. I chose Program blocks => Add new block => Function. When I write the keyword FUNCTION in my file I get the following error: tag FUNCTION not defined. This is the same for others keywords like VAR for example.</p>
  
  <p>My Code:</p>
  
  <pre><code>FUNCTION "test" :Void
  
  VAR
      V1: Bool;
  END_VAR
  
  END_FUNCTION
  </code></pre>
  
  <p>I searched the web but there is not a lot of documentation on the topic.
  Any idea to solve the problem?</p>