Here is the code to access the stock move from sale order line on Odoo 8:

class xx_sale_order_line(models.Model):

_inherit = 'sale.order.line'

@api.multi

def get_stock_moves(self, stock_picking_type_codes=['outgoing', 'internal'], values=None):

stock_picking_types = self.env['stock.picking.type'].search( [('code','in',stock_picking_type_codes)])

procurement_orders = self.env['procurement.order'].search([('sale_line_id','=',self.id)])

stock_moves = self.env['stock.move'].search([('procurement_id','in',[procurement_order.id for procurement_order in procurement_orders]),

('picking_type_id','in',[stock_picking_type.id for stock_picking_type in stock_picking_types])

])

return stock_moves        

Hello Ivan,

Thank you for your reply.

Unfortunately, in Odoo V9, there is no more reference of sale_xxx in stock_picking or stock_move tables ...

So you can't link sale and stock.

I want to do that, because I would like to get discount (from sale_order_line) to print it on delivery order (from stock.picking).

Edit 25/04/2016

Thank you Ahmed Ababneh, with your answer I built a SQL request :

SELECT e.NAME
FROM stock_picking a
 ,stock_move b
 ,procurement_order c
 ,sale_order_line d
 ,sale_order e
WHERE a.id = b.picking_id
 AND b.procurement_id = c.id
 AND c.sale_line_id = d.id
 AND d.order_id = e.id

Regards,

FTK