I am not sure if Premiere CC7 will work with Audtion CC14.
If Audition is greyed out try this. Its for older versions but it might work.
Look for the default .sesx files in your Document/Adobe/Audition/6.0/Session Templates folder (on Windows 7)
There should be a list of preset .sesx files. Right-click one and set its default application as Adobe Audition by using the "open with" option.