anchor.diff:                      "referenceUrn" : "urn:uuid:12345",
                       "type" : "Owns",
                       "relatedEntityReferenceType": "Object",
  -                    "relatedReferenceURN" : "urn:uuid:54321",
  +                    "relatedReferenceUrn" : "urn:uuid:54321",
                       "lastModifiedTimestamp" : 1390607277299,
                   }
               ]
  
positive.code:             {
                  "type": "Owns",
                  "relatedEntityReferenceType": "Object",
                  "relatedReferenceURN" : "urn:uuid:54321"
              }
  
  + Response 201 (application/json)
  
negative.code:                     "referenceUrn" : "urn:uuid:12345",
                      "type" : "Owns",
                      "relatedEntityReferenceType": "Object",
                      "relatedReferenceUrn" : "urn:uuid:54321",
                      "lastModifiedTimestamp" : 1390607277299,
                  }
              ]
  