**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.


for pull_rule in pull_rules_list:
                    pull_obj.create(cr, uid, vals=pull_rule, context=context)
                
                if default_resupply_wh and default_resupply_wh.id == wh.id:
                    self.write(cr, uid, [warehouse.id, wh.id], {'route_ids': [(4, inter_wh_route_id)]}, context=context)
    _defaults = {
        'company_id': lambda self, cr, uid, c: self.pool.get('res.company')._company_default_get(cr, uid, 'stock.inventory', context=c),
        'reception_steps': 'one_step',
        'delivery_steps': 'ship_only',
    }
    _sql_constraints = [
        ('warehouse_name_uniq', 'unique(name, company_id)', 'The name of the warehouse must be unique per company!'),
        ('warehouse_code_uniq', 'unique(code, company_id)', 'The code of the warehouse must be unique per company!'),
    ]
    def _get_partner_locations(self, cr, uid, ids, context=None):
        ''' returns a tuple made of the browse record of customer location and the browse record of supplier location'''
        data_obj = self.pool.get('ir.model.data')
        location_obj = self.pool.get('stock.location')
        try:
            customer_loc = data_obj.get_object_reference(cr, uid, 'stock', 'stock_location_customers')[1]
            supplier_loc = data_obj.get_object_reference(cr, uid, 'stock', 'stock_location_suppliers')[1]
        except:
            customer_loc = location_obj.search(cr, uid, [('usage', '=', 'customer')], context=context)
            customer_loc = customer_loc and customer_loc[0] or False
            supplier_loc = location_obj.search(cr, uid, [('usage', '=', 'supplier')], context=context)
            supplier_loc = supplier_loc and supplier_loc[0] or False
        if not (customer_loc and supplier_loc):
            raise osv.except_osv(_('Error!'), _('Can\'t find any customer or supplier location.'))
        return location_obj.browse(cr, uid, [customer_loc, supplier_loc], context=context)
    def _location_used(self, cr, uid, location_id, warehouse, context=None):