title: How to use one filter on two separate fields at the same time
body: <p>I am working on a Tableau visualisation of network data, showing trends in user behaviour. </p>
  
  <p>I have a table with users (USERS) and a table with network messages (MESSAGES): Each message has a sender and a receiver from the list of users.</p>
  
  <p>I have two worksheets, one showing trends of outgoing messages and one showing incoming messages. The two worksheets are placed in the same dashboard.</p>
  
  <p>How can I create a filter dropdown containing all users from USERS that filters senders in one worksheet and receivers in the second worksheet? </p>
  
  <p>I have tried to duplicate the MESSAGES data source and blend USERS with two different fields, but the performance is not acceptable. Any ideas are welcome.</p>
  
  <p>Thanks in advance</p>