Material Availability Check

Hi Experts,

I have created One Maintenance Order and Reserve some material say 100 PC.Now when I am doing availability checking for reserved material in Order.It is showing 100 pc confirmed.Hi Experts,System is considering those material which are ON -ORDER- STOCK as stock while checking availability,

Here I would like to know is this is standard setting to OPJJ include purchage Orders or should I remove this so that system will check the availability based on the actual unrestricted stock.Please tell me which is the best practice.

Regards,

Kavvya