**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
if context is None:
            context = {}
        if isinstance(ids, (int, long)):
            ids = [ids]
        picking_obj = self.pool['stock.picking']
        
        frozen_fields = set(['product_qty', 'product_uom', 'product_uos_qty', 'product_uos', 'location_id', 'location_dest_id', 'product_id'])
        moves = self.browse(cr, uid, ids, context=context)
        for move in moves:
            if move.state == 'done':
                if frozen_fields.intersection(vals):
                    raise osv.except_osv(_('Operation Forbidden!'),
                        _('Quantities, Units of Measure, Products and Locations cannot be modified on stock moves that have already been processed (except by the Administrator).'))
        propagated_changes_dict = {}
        
        if vals.get('product_uom_qty'):
            propagated_changes_dict['product_uom_qty'] = vals['product_uom_qty']
        if vals.get('product_uom_id'):
            propagated_changes_dict['product_uom_id'] = vals['product_uom_id']
        if vals.get('product_uos_qty'):
            propagated_changes_dict['product_uos_qty'] = vals['product_uos_qty']
        if vals.get('product_uos_id'):
            propagated_changes_dict['product_uos_id'] = vals['product_uos_id']
        
        propagated_date_field = False
        if vals.get('date_expected'):
            
            propagated_date_field = 'date_expected'
        elif (vals.get('state', '') == 'done' and vals.get('date')):