How to add Assets parts to work definition

Summary:

The part list has been added to the asset in Assets UI. While creating the work definition, on the right side , could see the second option as "Part List", searched for the asset, but the part list is not being displayed.Even when dragged and dropped, parts list are not being added to the WD

However able to add those parts through "Items" which is the third option on the right side

Content (required):

Need to know the process of adding the assets parts to the WD. However these parts are visible through the asset parts filter in Maintenance Work Order. The profile option is also enabled "ORA_CSE_AUTO_QUERY_PARTS_LIST"