title: How to set a default value on a boolean parameter with an expression in SSRS 2008?
body: <p>I am currently converting an inventory report from a web application into an SSRS report. I am trying to get the same functionality, but I am having trouble setting the default value of a boolean parameter based on the value of a previously selected parameter. The boolean parameter allows the user to search inventory for on hand product, true, or all product, false, if they are searching for back ordered products I want it to default, otherwise true. I am using an expression to determine with value to default to.</p>
  
  <pre><code>=iif(Parameters!Type.Value="Back Order",false,true)
  </code></pre>
  
  <p>When I run the report it has both true and false grayed out and neither is selected. I am trying to avoid using a multi-select drop down, but I fear I may need to to get the functionality I want.</p>
  
  <p>Thanks</p>