I will give another example. In integration bus, when I am subscribing I need to specify to what object I need to subscribe to. So when I tried to subscribe to bizform such as product question in sample site Ecommerce using object "PredefinedObjectType.BizForm", It didn't work. It worked when I used "bizformitem.bizform.%". My doubt is, whats the difference between objects of type "PredefinedObjectType.BizForm" and "bizformitem.bizform.%". Why it's working for the latter not the former.