**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.


addons/stock/stock.py
quant_obj = self.pool["stock.quant"]
        uom_obj = self.pool["product.uom"]
        res = {'value': {}}
        
        if product_id:
            product = self.pool.get('product.product').browse(cr, uid, product_id, context=context)
            uom = self.pool['product.uom'].browse(cr, uid, uom_id, context=context)
            if product.uom_id.category_id.id != uom.category_id.id:
                res['value']['product_uom_id'] = product.uom_id.id
                res['domain'] = {'product_uom_id': [('category_id','=',product.uom_id.category_id.id)]}
                uom_id = product.uom_id.id
        
        if product_id and location_id:
            product = self.pool.get('product.product').browse(cr, uid, product_id, context=context)
            if not company_id:
                company_id = self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.id
            dom = [('company_id', '=', company_id), ('location_id', '=', location_id), ('lot_id', '=', prod_lot_id),
                        ('product_id','=', product_id), ('owner_id', '=', partner_id), ('package_id', '=', package_id)]
            quants = quant_obj.search(cr, uid, dom, context=context)
            th_qty = sum([x.qty for x in quant_obj.browse(cr, uid, quants, context=context)])
            if product_id and uom_id and product.uom_id.id != uom_id:
                th_qty = uom_obj._compute_qty(cr, uid, product.uom_id.id, th_qty, uom_id)
            res['value']['theoretical_qty'] = th_qty
            res['value']['product_qty'] = th_qty
        return res
    def _resolve_inventory_line(self, cr, uid, inventory_line, context=None):