Is Process Extension from Purchase Order Item to Inbound Delivery possible?

Hi Experts,

I have a scenario where I am trying to extend the process with three fields from Purchase Order Item to Inbound Delivery and Supplier Invoice item levels.

I am able to get this done for Supplier Invoice Item Level but when I am trying to do it for Inbound Delivery where I don't fine those fields in reality when doing it.

Below is the Process Extension Scenario I had configured

I actually tried to extend the Business Object "InboundDelivery", technically called with UI name as Inbound Delivery Notification and enhance the screens

On User Front End I want to access these fields both on the following views, Please let me know where I can access and what the necessary Business Objects to extend and also what else I have extend in the above Scenario or any additional scenario needed?

Thanks.

Regards

Hanu K