In social network features in odoo 8. In one, Purchase Order > In Shipments > Transfer.

After transfer, it is showing "Products received Administrator updated document"

But I want to see who has clicked "Transfer" button. I have attached screen shot.

 What I have done, is. The "Transfer" button calls stock_picking's "do_enter_transfer_details" method. I just inherited the 'stock.picking' in my module. Created _columns={'partner_id': ...} it does not work. _columns={'flag': ...} shows error, server does not start. I think, I need to do something in "do_enter_transfer_details" method. But, don't know, what to do.