AX 2009 Production Order Screen

Hey Guys,

I have some inquiry regarding automatic calculation of job scheduling start and end time. Here’s the scenarion, I’ve created a production order, didi the estimation and job scheduling with which it shows me the start and end times. But when I changed the order quantity, ax didn’t automatically calculate the start and end times. Is there a way that ax will calculate automatically the start and end times upon changing the order quantity?

help please.

TIA