**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
''' Overwrite the read_group in order to sum the function field 'inventory_value' in group by'''
        res = super(stock_quant, self).read_group(cr, uid, domain, fields, groupby, offset=offset, limit=limit, context=context, orderby=orderby, lazy=lazy)
        if 'inventory_value' in fields:
            for line in res:
                if '__domain' in line:
                    lines = self.search(cr, uid, line['__domain'], context=context)
                    inv_value = 0.0
                    for line2 in self.browse(cr, uid, lines, context=context):
                        inv_value += line2.inventory_value
                    line['inventory_value'] = inv_value
        return res
    def action_view_quant_history(self, cr, uid, ids, context=None):
        '''
        This function returns an action that display the history of the quant, which
        mean all the stock moves that lead to this quant creation with this quant quantity.
        '''
        mod_obj = self.pool.get('ir.model.data')
        act_obj = self.pool.get('ir.actions.act_window')
        result = mod_obj.get_object_reference(cr, uid, 'stock', 'action_move_form2')
        id = result and result[1] or False
        result = act_obj.read(cr, uid, [id], context={})[0]
        move_ids = []
        for quant in self.browse(cr, uid, ids, context=context):
            move_ids += [move.id for move in quant.history_ids]
        result['domain'] = "[('id','in',[" + ','.join(map(str, move_ids)) + "])]"
        return result
    def quants_reserve(self, cr, uid, quants, move, link=False, context=None):