是否可以将对象（或对象类型）添加到 Windchill PDMLink 中的现有“订阅”

ERROR ... com.ptc.core.components.jsp.JspUtils <Userid> - wt.util.WTException: java.lang.ClassCastException: wt.pdmlink.PDMLinkProduct cannot be cast to wt.notify.NotificationSubscription
Nested exception is: java.lang.ClassCastException: wt.pdmlink.PDMLinkProduct cannot be cast to wt.notify.NotificationSubscription
wt.util.WTException: java.lang.ClassCastException: wt.pdmlink.PDMLinkProduct cannot be cast to wt.notify.NotificationSubscription
Nested exception is: java.lang.ClassCastException: wt.pdmlink.PDMLinkProduct cannot be cast to wt.notify.NotificationSubscription
    at wt.notify.NotificationDataModelManager.getNotificationSubscription(NotificationDataModelManager.java)
    at wt.notify.StandardNotificationManager.getNotificationSubscription(StandardNotificationManager.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java)
    at java.lang.reflect.Method.invoke(Method.java)