title: Variables in TFS Mappings on Visual Studio Online Team Builds
body: <p>I have created a VSO build using the new Team build system which uses TFS as the Repository.  I would like to introduce a variable into the Mappings -> Map value but when I do I get this error:</p>
  
  <pre><code>TF10122: The path '$/YourProject/${Build}' contains a '$' at the beginning of a path component. Remove the '$' and try again.
  </code></pre>
  
  <p>Is there a way to accomplish this or do I need to just hard code my Map path?</p>