How to setup automatic Stock-Checking for Stock Avaialbility in Order Entry ?

 Hi,

We are on 11.5.10.2. ATP is disbaled as that used you give a lots of problems. We are looking ,'How to verify stock availablability automically' during OE. After pressing 'Book Order', the application should display warning or error message as it is doing for ' Credit Checking' or in case when 'Salesperson' is not entered.

How the above can be achieved? Is that done through 'Setup' or 'Profile' options. Is that standard function?

Where is that and how can be activated?

In fact, I created this discussion in August 2010 and there are updates / answers to the issue. But JFr asked 2 califications, which I made but then there is update from JFR side. I wana reply for those.