**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.


""" Move all non-done lines into a new backorder picking. If the key 'do_only_split' is given in the context, then move all lines not in context.get('split', []) instead of all non-done lines.
        """
        if not backorder_moves:
            backorder_moves = picking.move_lines
        backorder_move_ids = [x.id for x in backorder_moves if x.state not in ('done', 'cancel')]
        if 'do_only_split' in context and context['do_only_split']:
            backorder_move_ids = [x.id for x in backorder_moves if x.id not in context.get('split', [])]
        if backorder_move_ids:
            backorder_id = self.copy(cr, uid, picking.id, {
                'name': '/',
                'move_lines': [],
                'pack_operation_ids': [],
                'backorder_id': picking.id,
            })
            backorder = self.browse(cr, uid, backorder_id, context=context)
            self.message_post(cr, uid, picking.id, body=_("Back order <em>%s</em> <b>created</b>.") % (backorder.name), context=context)
            move_obj = self.pool.get("stock.move")
            move_obj.write(cr, uid, backorder_move_ids, {'picking_id': backorder_id}, context=context)
            if not picking.date_done:
                self.write(cr, uid, [picking.id], {'date_done': time.strftime(DEFAULT_SERVER_DATETIME_FORMAT)}, context=context)
            self.action_confirm(cr, uid, [backorder_id], context=context)
            return backorder_id
        return False
    @api.cr_uid_ids_context
    def recheck_availability(self, cr, uid, picking_ids, context=None):