UDF or FMS Query Question

Hi,

I have a UDF in Item Master which I call it Part Number.

I don't want to do an auto FMS for this UDF in marketing document row when I select an item. However, I want to type in the Part Number (just like how we are able to type in the item code) in my marketing documents row and the details of the item master such as item code and item description will appear. Is this doable?