RE: Tracking NAV objects Changes
as amol and dmitry described, there is no out of the box object change tracking in nav standard.
what you need is a defined update process.
best you contact your nav partner, describe your needs, clarify the problems. seems that these necessary coordination steps were not done. setting the objects time to 12:00 is a standard process defined by microsoft. you are right, that can be irritating. so tell your nav partner you prefer not setting the time to 12:00. also, more important, you need a notification, before your nav partner imports updates. i hope, your nav partner uses a ticket system to have a chronology of the communication and changes. always check, if your nav partner updates the documentation trigger, so you can check, what kind of changes were done. if you do not have a developer license you need the nav objects's change description as mail or within the ticket in the ticket system or as text file. otherwise you do not have any information about the changes.
if your nav partner does not help you in that case, think about changing the nav partner.