**Impacted versions:** 8.0

**Steps to reproduce:**
To reproduce it is necessary the fifo configuration in the assignation of quants in moves.

- Create a sale order with two lines of the same product, one of that line with a route that generate moves between warehouse.

<img width="1231" alt="skitch 65" src="https://cloud.githubusercontent.com/assets/11341058/24102907/d575a638-0d53-11e7-922e-a3f034d43e94.png">

The route used has three pull rules:

1. From Stock Warehouse_1 to Virtual Locations/Inter Company Transit
2. From Virtual Locations/Inter Company Transit to Stock Warehouse_2
3. From Stock Warehouse_2 to Customers

<img width="1224" alt="skitch 66" src="https://cloud.githubusercontent.com/assets/11341058/24103147/b7c2bfbc-0d54-11e7-955c-87247a10e0bd.png">

- Confirm the sale order. It must be created three pickings:

<img width="1226" alt="skitch 67" src="https://cloud.githubusercontent.com/assets/11341058/24103498/d90c9b38-0d55-11e7-97ff-f986df8cdd9b.png">

- Transfer first two pickings.

<img width="1230" alt="skitch 70" src="https://cloud.githubusercontent.com/assets/11341058/24104496/b7b0be8a-0d58-11e7-89a2-4331fceec1d8.png">

- Before transfer third picking, review that one move has reserved the quant correctly because was reserved from the previous pickings.

<img width="1215" alt="skitch 68" src="https://cloud.githubusercontent.com/assets/11341058/24103908/23952cc8-0d57-11e7-9346-bd48d7edb54a.png">

**Current behavior:**

When check availability of this third picking, the quant already reserved is moved to the other move.

<img width="1264" alt="skitch 69" src="https://cloud.githubusercontent.com/assets/11341058/24104056/8be11616-0d57-11e7-8763-a90507315b19.png">
 
**Expected behavior:**

When check availability of this third picking, the moves already reserved must not be altered.


""" Changes state of picking to available if moves are confirmed or waiting.
        @return: True
        """
        for pick in self.browse(cr, uid, ids, context=context):
            move_ids = [x.id for x in pick.move_lines if x.state in ['confirmed', 'waiting']]
            self.pool.get('stock.move').force_assign(cr, uid, move_ids, context=context)
        
        self.write(cr, uid, ids, {'recompute_pack_op': True}, context=context)
        return True
    def action_cancel(self, cr, uid, ids, context=None):
        for pick in self.browse(cr, uid, ids, context=context):
            ids2 = [move.id for move in pick.move_lines]
            self.pool.get('stock.move').action_cancel(cr, uid, ids2, context)
        return True
    def action_done(self, cr, uid, ids, context=None):
        """Changes picking state to done by processing the Stock Moves of the Picking
        Normally that happens when the button "Done" is pressed on a Picking view.
        @return: True
        """
        for pick in self.browse(cr, uid, ids, context=context):
            todo = []
            for move in pick.move_lines:
                if move.state == 'draft':
                    todo.extend(self.pool.get('stock.move').action_confirm(cr, uid, [move.id], context=context))
                elif move.state in ('assigned', 'confirmed'):
                    todo.append(move.id)
            if len(todo):
                self.pool.get('stock.move').action_done(cr, uid, todo, context=context)
        return True
    def unlink(self, cr, uid, ids, context=None):