Inventory Closing

Hi All

Client is not regularly closing the inventory process ,but Financial period closing process runs on the every year .

I got stuck, while running inventory closing process in NAV 2015, with a transaction trying to post in 2015 (Period is closed).

We understand the issue with closed period, but need suggestion on what should be my course of action (in system and with business) to get around this error.

Please share your thoughts based on your experience with similar situation/issue.

Thanks in advance