**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.


context = context or {}
        if ('name' not in vals) or (vals.get('name') in ('/', False)):
            ptype_id = vals.get('picking_type_id', context.get('default_picking_type_id', False))
            sequence_id = self.pool.get('stock.picking.type').browse(cr, user, ptype_id, context=context).sequence_id.id
            vals['name'] = self.pool.get('ir.sequence').get_id(cr, user, sequence_id, 'id', context=context)
        return super(stock_picking, self).create(cr, user, vals, context)
    def _state_get(self, cr, uid, ids, field_name, arg, context=None):
        '''The state of a picking depends on the state of its related stock.move
            draft: the picking has no line or any one of the lines is draft
            done, draft, cancel: all lines are done / draft / cancel
            confirmed, waiting, assigned, partially_available depends on move_type (all at once or partial)
        '''
        res = {}
        for pick in self.browse(cr, uid, ids, context=context):