**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.


if diff < 0:
            
            vals['location_id'] = inventory_location_id
            vals['location_dest_id'] = inventory_line.location_id.id
            vals['product_uom_qty'] = -diff
        else:
            
            vals['location_id'] = inventory_line.location_id.id
            vals['location_dest_id'] = inventory_location_id
            vals['product_uom_qty'] = diff
        move_id = stock_move_obj.create(cr, uid, vals, context=context)
        move = stock_move_obj.browse(cr, uid, move_id, context=context)
        if diff > 0:
            domain = [('qty', '>', 0.0), ('package_id', '=', inventory_line.package_id.id), ('lot_id', '=', inventory_line.prod_lot_id.id), ('location_id', '=', inventory_line.location_id.id)]
            preferred_domain_list = [[('reservation_id', '=', False)], [('reservation_id.inventory_id', '!=', inventory_line.inventory_id.id)]]
            quants = quant_obj.quants_get_prefered_domain(cr, uid, move.location_id, move.product_id, move.product_qty, domain=domain, prefered_domain_list=preferred_domain_list, restrict_partner_id=move.restrict_partner_id.id, context=context)
            quant_obj.quants_reserve(cr, uid, quants, move, context=context)
        elif inventory_line.package_id:
            stock_move_obj.action_done(cr, uid, move_id, context=context)
            quants = [x.id for x in move.quant_ids]
            quant_obj.write(cr, SUPERUSER_ID, quants, {'package_id': inventory_line.package_id.id}, context=context)
            res = quant_obj.search(cr, uid, [('qty', '<', 0.0), ('product_id', '=', move.product_id.id),
                                    ('location_id', '=', move.location_dest_id.id), ('package_id', '!=', False)], limit=1, context=context)
            if res:
                for quant in move.quant_ids:
                    if quant.location_id.id == move.location_dest_id.id: 
                        quant_obj._quant_reconcile_negative(cr, uid, quant, move, context=context)
        return move_id
    
    def restrict_change(self, cr, uid, ids, theoretical_qty, context=None):