Serialization fixed

js/entity/PinReferenceEntity.js

@@ -1,10 +1,11 @@
 import Entity from "./Entity"
 import Guid from "./primitive/Guid"
+import PathSymbol from "./primitive/PathSymbol"
 
 export default class PinReferenceEntity extends Entity {
 
     static attributes = {
-        objectName: String,
+        objectName: PathSymbol,
         pinGuid: Guid
     }