**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 move in self.browse(cr, uid, ids, context=context):
            if move.product_id.uom_id.category_id.id != move.product_uom.category_id.id:
                return False
        return True
    _constraints = [
        (_check_uom,
            'You try to move a product using a UoM that is not compatible with the UoM of the product moved. Please use an UoM in the same UoM category.',
            ['product_uom']),
    ]
    def init(self, cr):
        cr.execute('SELECT indexname FROM pg_indexes WHERE indexname = %s', ('stock_move_product_location_index',))
        if not cr.fetchone():
            cr.execute('CREATE INDEX stock_move_product_location_index ON stock_move (product_id, location_id, location_dest_id, company_id, state)')
    @api.cr_uid_ids_context
    def do_unreserve(self, cr, uid, move_ids, context=None):
        quant_obj = self.pool.get("stock.quant")
        for move in self.browse(cr, uid, move_ids, context=context):
            if move.state in ('done', 'cancel'):
                raise osv.except_osv(_('Operation Forbidden!'), _('Cannot unreserve a done move'))
            quant_obj.quants_unreserve(cr, uid, move, context=context)
            if self.find_move_ancestors(cr, uid, move, context=context):
                self.write(cr, uid, [move.id], {'state': 'waiting'}, context=context)
            else:
                self.write(cr, uid, [move.id], {'state': 'confirmed'}, context=context)
    def _prepare_procurement_from_move(self, cr, uid, move, context=None):