**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 picking.move_lines:
                    remaining_qty = move.remaining_qty
                    if move.state in ('done', 'cancel'):
                        
                        continue
                    elif move.state == 'draft':
                        toassign_move_ids.append(move.id)
                    if float_compare(remaining_qty, 0,  precision_rounding = move.product_id.uom_id.rounding) == 0:
                        if move.state in ('draft', 'assigned', 'confirmed'):
                            todo_move_ids.append(move.id)
                    elif float_compare(remaining_qty,0, precision_rounding = move.product_id.uom_id.rounding) > 0 and \
                                float_compare(remaining_qty, move.product_qty, precision_rounding = move.product_id.uom_id.rounding) < 0:
                        new_move = stock_move_obj.split(cr, uid, move, remaining_qty, context=notrack_context)
                        todo_move_ids.append(move.id)
                        
                        toassign_move_ids.append(new_move)
                if need_rereserve or not all_op_processed: 
                    if not picking.location_id.usage in ("supplier", "production", "inventory"):
                        self.rereserve_quants(cr, uid, picking, move_ids=todo_move_ids, context=context)
                    self.do_recompute_remaining_quantities(cr, uid, [picking.id], context=context)
                if todo_move_ids and not context.get('do_only_split'):
                    self.pool.get('stock.move').action_done(cr, uid, todo_move_ids, context=notrack_context)
                elif context.get('do_only_split'):
                    context = dict(context, split=todo_move_ids)
            self._create_backorder(cr, uid, picking, context=context)
            if toassign_move_ids:
                stock_move_obj.action_assign(cr, uid, toassign_move_ids, context=context)
        return True
    @api.cr_uid_ids_context
    def do_split(self, cr, uid, picking_ids, context=None):