sale_stock not working in Odoo v8
I am trying to deploy a custom module which relates certain fields from order to stock.picking.
I was about to use sale_id relation in stock_picking,and I just realized that sale_id is not in stock_picking table.
I checked sale_stock installation, it seems to be properly installed but the field is not there.
Is there any known issue with sale_stock in Odoo v8?