Prevent Change agent from making changes to requests after approved

Question

Does anyone know how to block changes made to a Change Request after it has been approved?

Answer 1

If you're talking about preventing changes to a change request record after it's been approved, I have a couple suggestions, but they require custom development effort.
One possibility would be to create a custom control applied to the Change Request form that does this for you. Using Anton's custom control technique, you could create a control that, when the form loads, reads the current state of a
CR's review activity and, if it's approved, finds and disables all of the controls on the form.
http://blog.scsmsolutions.com/2011/08/create-custom-user-control-for-scsm-2010/ This post is for SCSM 2010, but the principal is the same for SCSM 2012.
Another possibility is to create your own Change Request form from scratch that implements similar capability (ie: every time the form is opened, the FormLoad event checks the state of the review activity and disables/enabled all other form controls appropriately).
Creating your own form would require you to override the out-of-the-box form for which there is no supported method yet. Plus, creating your own change request form would require much more development effort including knowledge of Visual Studio, WPF/XAML,
C#, and the unsupported console API.
These techniques to "block" changes will only work on a form, though. A user would still be able to make changes directly with powershell or the SDK. They could also make changes with any of the out-of-the-box console tasks that manipulate change requests.
I'm afraid there's no "simple" answer, though.
However, keep in mind that all changes to any record in Service Manager are recorded in the history of that record. So while it might be difficult to block changes, you can always review any changes that were made after a CR has been approved, including
who made the change and when. That's more of a reactive approach instead of a proactive approach.