title: missing many-to-one associations in OData Feed (olingo)
body: <p>I built a OData Producer based on apache olingo, JPA and mySQL following <a href="http://scn.sap.com/community/netweaver-gateway/blog/2014/02/05/odata-producer-using-apache-olingo-with-mysql-jpa-tomcat-web-server" rel="nofollow">this tutorial</a>
  While many-to-many associations are displayed within the OData Feed, many-to-one associations are not displayed at all (neither are their JOIN-columns visible)</p>
  
  <p>Does anyone have an idea, how to get olingo to display those Associations?</p>