How to disable Manual Reservation in Customer Order Line?

Hi, I don't know which “window”you are in, but can this help :-)? Look at Jabous answer.

@saiful as far as I remember (it’s been a while since I worked with Apps10), the RMB options that are available are calculated with some functions in the PL/SQL API. Therefore, I guess it would require a modification to get what you are asking for.