**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.


store={
                                       'stock.quant': (_get_packages, ['company_id'], 10),
                                       'stock.quant.package': (_get_packages_to_relocate, ['quant_ids', 'children_ids', 'parent_id'], 10),
                                    }, readonly=True, select=True),
        'owner_id': fields.function(_get_package_info, type='many2one', relation='res.partner', string='Owner', multi="package",
                                store={
                                       'stock.quant': (_get_packages, ['owner_id'], 10),
                                       'stock.quant.package': (_get_packages_to_relocate, ['quant_ids', 'children_ids', 'parent_id'], 10),
                                    }, readonly=True, select=True),
    }
    _defaults = {
        'name': lambda self, cr, uid, context: self.pool.get('ir.sequence').get(cr, uid, 'stock.quant.package') or _('Unknown Pack')
    }
    def _check_location_constraint(self, cr, uid, packs, context=None):
        '''checks that all quants in a package are stored in the same location. This function cannot be used
           as a constraint because it needs to be checked on pack operations (they may not call write on the
           package)
        '''
        quant_obj = self.pool.get('stock.quant')
        for pack in packs:
            parent = pack
            while parent.parent_id:
                parent = parent.parent_id
            quant_ids = self.get_content(cr, uid, [parent.id], context=context)
            quants = [x for x in quant_obj.browse(cr, uid, quant_ids, context=context) if x.qty > 0]
            location_id = quants and quants[0].location_id.id or False
            if not [quant.location_id.id == location_id for quant in quants]:
                raise osv.except_osv(_('Error'), _('Everything inside a package should be in the same location'))
        return True
    def action_print(self, cr, uid, ids, context=None):