Override change management settings in Purchase Order

Change management introduces a managed workflow that makes sure that purchase orders are locked when they have been approved.

https://technet.microsoft.com/en-us/library/hh802989.aspx

Some time we need to give exception for some vendors so, AX provides us way to override the change management settings per vendor per Purchase order level. For details , Please see the below the link.

http://dynamicsteaching.com/importance-of-change-management-feature-in-ax-2012/