title: Passing $expand parameter to an OData function
body: <p>So I have implemented a function import using NW Gateway and I was pleasantly surprised to find that I could add the oData query option $expand and it worked!</p>
  
  <p>Now I want to take advantage of that by passing a $expand parameter from my SAPUI5 application. But I can't find a way to make this work. My call looks something like this...</p>
  
  <pre><code>oModel.callFunction("/VehicleSearch", {
    method: 'GET',
    urlParameters: {"$expand": "Owner", "SearchString": searchString},
    success: function(oData, response) { },
    failure: $.proxy(function(oError) { } 
  });
  </code></pre>
  
  <p>The SearchString parameter is passed but not the $expand.</p>