**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
""" This function will return true if we have the setting to use lots activated. """
        return self.pool.get('res.users').has_group(cr, uid, 'stock.group_production_lot')
    def check_group_pack(self, cr, uid, context=None):
        """ This function will return true if we have the setting to use package activated. """
        return self.pool.get('res.users').has_group(cr, uid, 'stock.group_tracking_lot')
    def action_assign_owner(self, cr, uid, ids, context=None):
        for picking in self.browse(cr, uid, ids, context=context):
            packop_ids = [op.id for op in picking.pack_operation_ids]
            self.pool.get('stock.pack.operation').write(cr, uid, packop_ids, {'owner_id': picking.owner_id.id}, context=context)
    _columns = {
        'name': fields.char('Reference', select=True, states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, copy=False),
        'origin': fields.char('Source Document', states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, help="Reference of the document", select=True),
        'backorder_id': fields.many2one('stock.picking', 'Back Order of', states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, help="If this shipment was split, then this field links to the shipment which contains the already processed part.", select=True, copy=False),
        'note': fields.text('Notes'),
        'move_type': fields.selection([('direct', 'Partial'), ('one', 'All at once')], 'Delivery Method', required=True, states={'done': [('readonly', True)], 'cancel': [('readonly', True)]}, help="It specifies goods to be deliver partially or all at once"),
        'state': fields.function(_state_get, type="selection", copy=False,
            store={
                'stock.picking': (lambda self, cr, uid, ids, ctx: ids, ['move_type'], 20),
                'stock.move': (_get_pickings, ['state', 'picking_id', 'partially_available'], 20)},
            selection=[
                ('draft', 'Draft'),
                ('cancel', 'Cancelled'),
                ('waiting', 'Waiting Another Operation'),