title: StarUML ER diagram with relation with 3 entities
body: <p>I'm using StarUML in order to do a ER diagram and I can create relation with two entities like this:</p>
  
  <p><a href="https://i.stack.imgur.com/uVObM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uVObM.png" alt="relation with two entity"></a></p>
  
  <p>and in StarUML:</p>
  
  <p><a href="https://i.stack.imgur.com/XPPCc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XPPCc.png" alt="in StarUML"></a></p>
  
  <p>But I cannot create a relation with 3 entity like this:</p>
  
  <p><a href="https://i.stack.imgur.com/swrRW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/swrRW.png" alt="relation with 3 entities"></a></p>
  
  <p>Have you some ideas to do it in StarUML?</p>