title: Minus Parameter in expression of report
body: <p>I have this expression into my report</p>
  
  <pre><code>=Parameters!DimTiempoAnio.Value(0)
  </code></pre>
  
  <p>When I execute report it returns:</p>
  
  <pre><code>[Dim_Tiempo_].[Anio].&amp;[2016]
  </code></pre>
  
  <p>I want to minus 1 to 2016 so I just do:</p>
  
  <pre><code>=Parameters!DimTiempoAnio.Value(0) -1 
  </code></pre>
  
  <p>But it throws me an error and it just don´t specify why, can someone help me how can I achieve this?</p>
  
  <p><a href="https://i.stack.imgur.com/v5dYw.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/v5dYw.png" alt="enter image description here"></a></p>