in the sales order when ever we enter the material and press enter it will show also the availalabe quantity based on ATP check. suppose i entered material quantity as 30 but in the stock only 10 are availabe , then the system allows to save the order. But i dont want the order to be saved if the quanity is not the same as i entered, it means if all the quantity is avaiable on the speciifed date then the order to be saved otherwise it should not save.
if any standard settings available to do this tell me, we dont want to use user exits.