This activity is used to revert all the changes done to a part group due to the active change source. It is generally performed when you have unpublished changes on the active change source, such as in the middle of an IPC update, and when you want to action a manual change due to other literature affecting the configuration data. Once the changes have been reverted, you will be able to modify the change source for the part group to the other change source and make manual changes to the part group, as required. You can then publish the active change source, and set the change source back to the one with changes to be made.