title: SSRS multi value parameter - can't get it to work
body: <p>First off this is my first attempt at a multi select. I've done a lot of searching but I can't find the answer that works for me.</p>
  
  <p>I have a postgresql query which has bg.revision_key in (_revision_key) which holds the parameter. A side note, we've named all our parameters in the queries with the underscore and they all work, they are single select in SSRS. </p>
  
  <p>In my SSRS report I have a parameter called Revision Key Segment which is the multi select parameter. I've ticked Allow multi value and in Available Values I have value field pointing to revision_key in the dataset.</p>
  
  <p>In my dataset parameter options I have Parameter Value [@revision_key] </p>
  
  <p>In my shared dataset I also have my parameter set to Allow multi value.</p>
  
  <p>For some reason I can't seem to get the multi select to work so I must be missing something somewhere but I've ran out of ideas. </p>