I'm trying to display product location in product form view and product tree view but with no success.

Field related won't work, I tried to add extra field and create relation between location_id and newly created field "prod_loc"

but it still won't work.

How can I do this ?
More details:

I need a product location (location_id) displayed on product page(form_view). Unfortunately added <field name="location_id"/> does not work giving an error message (location_id is not available in this view or something like that) so I created a relation which work but not as I expected. If I use this I can pick a location from list and it will be displayed. Unfortunately if I move product into another location this change doesn't will be shown and still show me the old information.

How to make it "Live" ?