**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
product_uom[move.product_id.id] = move.product_id.uom_id
            if move.product_uom.id != move.product_id.uom_id.id and move.product_uom.factor > product_uom[move.product_id.id].factor:
                product_uom[move.product_id.id] = move.product_uom
            if not move.scrapped:
                if location_dest_id and move.location_dest_id.id != location_dest_id:
                    raise Warning(_('The destination location must be the same for all the moves of the picking.'))
                location_dest_id = move.location_dest_id.id
                if location_id and move.location_id.id != location_id:
                    raise Warning(_('The source location must be the same for all the moves of the picking.'))
                location_id = move.location_id.id
        pack_obj = self.pool.get("stock.quant.package")
        quant_obj = self.pool.get("stock.quant")
        vals = []
        qtys_grouped = {}
        
        quants_suggested_locations = {}
        product_putaway_strats = {}
        for quant in quants:
            if quant.qty <= 0:
                continue
            suggested_location_id = _picking_putaway_apply(quant.product_id)
            quants_suggested_locations[quant] = suggested_location_id
        
        top_lvl_packages = self._get_top_level_packages(cr, uid, quants_suggested_locations, context=context)
        
        for pack in top_lvl_packages:
            pack_quant_ids = pack_obj.get_content(cr, uid, [pack.id], context=context)
            pack_quants = quant_obj.browse(cr, uid, pack_quant_ids, context=context)
            vals.append({
                    'picking_id': picking.id,